US 7314033

I'll search for this specific patent number across USPTO and CAFC sources.

Let me dig deeper on litigation/appeal status specific to this patent.

US Patent 7,314,033 — Analyst Summary

Verification note up front: I searched for the literal identifier 7314033 (US 7,314,033 B2). I did not find any 2026 CAFC docket or 2026 Federal Circuit opinion that lists US 7,314,033 itself as the patent on appeal. What I did find is a Ford/MIT/Ethanol Boosting Systems litigation family in which 7,314,033 appears as an ancestor patent (its file history is used as an exhibit), and a Dec. 23, 2025 Federal Circuit decision that concerned other MIT patents in the same family, not 7,314,033. I flag that distinction explicitly below rather than implying a direct 2026 appeal exists.

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Bibliographic data

Sources: Google Patents full text (https://patents.google.com/patent/[US7314033B2](/patent/US7314033B2)/en); Docket Alarm PTAB file-history exhibits referencing "Application No. 10/991,774 … Patent 7314033 … 2008-01-01" (https://www.docketalarm.com/cases/PTAB/IPR2021-00340/…/Exhibit-1019-20-Exhibit_1019___983_File_History.pdf); USPTO assignment records surfaced via legacy-assignments.uspto.gov.

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Abstract (as issued)

"Fuel management system for efficient operation of a spark ignition gasoline engine. Injectors inject an anti-knock agent such as ethanol directly into a cylinder of the engine. A fuel management microprocessor system controls injection of the anti-knock agent so as to control knock and minimize that amount of the anti-knock agent that is used in a drive cycle. It is preferred that the anti-knock agent is ethanol. The use of ethanol can be further minimized by injection in a non-uniform manner within a cylinder. The ethanol injection suppresses knock so that higher compression ratio and/or engine downsizing from increased turbocharging or supercharging can be used to increase the efficiency of the engine."

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Independent claims — plain-language overview

All four claims cover the same core architecture: a turbocharged spark-ignition engine that is fueled by port fuel injection (PFI) of gasoline plus direct injection of liquid denatured ethanol from a separate source, run at substantially stoichiometric air/fuel, with a microprocessor fuel-management system that ramps the ethanol (energy) fraction up with torque to suppress knock, and that can fall back to gasoline-only operation (by cutting/reducing boost) if the ethanol tank runs dry.

Shared limitations in every claim (1–4):

• Spark-ignition engine + turbocharger + PFI gasoline means + direct-injection denatured-ethanol means.
• During part of operating time the engine runs on both PFI gasoline and DI ethanol.
• The instantaneous ethanol energy fraction reaches at least 20%.
• The ethanol is directly injected in an amount such that evaporative charge cooling plus ethanol's higher octane number raises the octane number by at least 20 octane numbers.
• The microprocessor increases the ethanol energy fraction with increasing torque enough to prevent knock, and minimizes ethanol use based on knock-detector information.
• The microprocessor uses the ethanol level in the second source to control the turbocharger; turbocharging is eliminated or reduced when there is no ethanol.
• The vehicle can be driven on PFI gasoline alone without knock.

Claim 1 — Adds that the fuel management system uses closed-loop control, taking information from a knock detector to vary the ethanol energy fraction when the instantaneous fraction is ≥20% (feedback-based knock suppression).

Claim 2 — Adds combined open-loop + closed-loop control: open loop via a look-up table, closed loop via a knock detector. It also adds a performance floor: the engine runs knock-free at a horsepower level at least twice that achievable on PFI gasoline alone.

Claim 3 — Builds on Claim 2's open-loop-look-up-table + closed-loop scheme, and adds spark-retard control: the microprocessor uses the ethanol level to control spark retard, with spark retard increased when there is no ethanol; it also carries the "at least twice the horsepower" limitation.

Claim 4 (most detailed) — Broadens the fuel definition to a fuel that consists of both PFI gasoline and DI ethanol, and softens the fraction trigger to "under some operating conditions the instantaneous ethanol energy fraction is at least 20%." It adds: the open loop uses a predetermined correlation between required octane enhancement and the fuel fraction supplied by ethanol; the system measures ethanol level to control turbocharging and spark retard when ethanol is low; the engine can run on denatured ethanol alone; the ethanol fraction needed to prevent knock is reduced by concentrating ethanol in the end-gas regions prone to auto-ignition; ethanol is injected near the cylinder walls; swirl creates a ring of ethanol near the walls; and the ethanol is mixed with a lubricant.

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Litigation / PTAB context found (and how 7,314,033 relates)

• District court: Ethanol Boosting Systems, LLC and Massachusetts Institute of Technology v. Ford Motor Company, D. Del. Civil Action No. 1:19-cv-00196-CFC (MIT owns the family; EBS is exclusive licensee).
• PTAB: Ford filed numerous IPRs against later family patents (e.g., IPR2019-01399 through -01402, IPR2020-00010, -00011, -00012). In those proceedings, the file history of US 7,314,033 was submitted as an exhibit (e.g., "Exhibit 1121 – File History of U.S. Patent No. 7,314,033" and "Exhibit 1021 – File History of U.S. Patent No. 7,314,033") — i.e., 7,314,033 was used as priority/continuity evidence, not as the challenged patent. Several of those petitions were initially denied institution in March 2020.
• Federal Circuit (most recent, but not on 7,314,033): Ethanol Boosting Systems, LLC, et al. v. Ford Motor Co., Case Nos. 2024-1381, -1382, -1383 (Fed. Cir. Dec. 23, 2025) (Chen, Clevenger, Hughes, JJ.). That appeal affirmed three PTAB final written decisions holding claims of US 10,619,580, US 10,781,760, and US 9,708,965 unpatentable as obvious. The court also held that challenges to the Board's institution authority are largely insulated from review under 35 U.S.C. § 314(d), and that a district court's claim construction does not bind the Board. (Coverage: https://www.lexology.com/library/detail.aspx?g=9c04df1a-64e0-4a4b-9678-9ab80e39073e; also summarized in a JPO 2025 patent-litigation survey referencing "Ethanol Boosting Systems, LLC / Massachusetts Institute of Technology v. Ford Motor Company (Dec. 23, 2025)").

Uncertainty statement: I have no authoritative confirmation of a 2026 CAFC docket or 2026 Federal Circuit decision specifically naming US 7,314,033. My searches returned 2025–2026 activity only for sibling/descendant patents in the same MIT/EBS family. Given the patent's legal status shows "Expired – Fee Related" with anticipated expiration 2024-11-18, a live 2026 appeal on this specific patent is unlikely, but I cannot rule out docket activity I could not retrieve — I did not obtain a direct USPTO PatentCenter or CAFC docket page for 7,314,033 during this search.

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Quick reference — URLs used

• Google Patents full text: https://patents.google.com/patent/US7314033B2/en
• PTAB/file-history exhibits referencing 7,314,033: https://www.docketalarm.com/cases/PTAB/IPR2021-00340/ (Exhibit-1019-20; Exhibit-1022)
• PTAB case pages (Ford v. MIT, IPR2020-00010/-00011/-00012): https://services.patexia.com/lawsuits/Ford-Motor-Company-v-Massachusetts-Institute-of-Technology-et-al-id-[129369](/patent/129369)/documents/ and https://gaeflexstaging-dot-docketupdate.appspot.com/cases/PTAB/IPR2020-00011/…
• Fed. Cir. 2024-1381/-1382/-1383 write-up: https://www.lexology.com/library/detail.aspx?g=9c04df1a-64e0-4a4b-9678-9ab80e39073e

I'll research litigation involving US patent 7314033 across patent litigation databases.

Let me dig deeper into specific litigation databases and PTAB proceedings.

Let me search specific litigation databases and the Unified Patents portal for this exact patent.

Bottom line

Based on my searches of patent-litigation sources (Google Patents litigation data, the Fed. Cir./CourtListener dockets, PTAB documents, Darts‑ip family flag, and third‑party litigation summaries), I found no litigation in which U.S. Patent No. 7,314,033 ("the '033 patent") was itself the patent‑in‑suit or the challenged patent. The '033 patent is the original MIT parent of a very large family, and essentially all of the enforcement and validity litigation in that family has run through its continuations, not through the '033 patent itself.

A caveat on strictness: I did not find a district‑court complaint or an IPR petition that names 7,314,033 as an asserted/challenged claim set. I cannot rule out a licensing dispute or a settlement that never produced a public docket, and Darts‑ip's "first worldwide family litigation filed" flag on the '033 Google Patents page confirms that family litigation exists. But nothing I found asserts the '033 patent's own claims.

One thing to be careful about: I did find a petition exhibit list that includes "Ex. 1121 — File History of U.S. Patent No. 7,314,033" filed alongside the Ford I complaint (Ex. 1122, Ethanol Boosting Sys. LLC v. Ford Motor Co., C.A. No. 19‑cv‑196‑CFC). That is the '033 prosecution history used as evidence in an IPR about a different family member — not an assertion of the '033 patent.

Family litigation you asked about (context — these involve continuations, NOT the '033 patent)

Because the '033 patent is the root of this family, here is the documented litigation so you can see precisely which patents were asserted. None of the numbers below is 7,314,033. I flag them as related, not as '033 litigation.

The Federal Circuit's December 23, 2025 decision is precedential and addressed § 314(d) reviewability, claim‑construction mandate‑rule arguments, and substantial‑evidence review of the obviousness findings.

Important distinction

• US 7,314,033 itself: no infringement suit, no IPR, no PTAB proceeding found naming it as the challenged patent. Its claims appear to have been used only as family prosecution‑history/priority evidence in litigation over its children.
• Family (same specification/priority, 2004‑11‑18): extensive litigation, all centered on continuation patents such as 9,810,166; 8,009,839; 9,255,519; 10,138,826; 9,708,965; 10,619,580; 10,781,760 — plus the many later continuations in the family.

Recommended verification (since you need litigation‑grade accuracy)

Because I could not exhaust every source in this session, before relying on this I'd confirm directly at:

1. PACER / CourtListener — search "Ethanol Boosting Systems" as party (all districts).
2. PTAB (ptacts.uspto.gov / PTAB API) — search "7,314,033" and "7314033" as the patent number (not the family) to confirm no IPR/PGR exists.
3. Unified Patents litigation portal (https://portal.unifiedpatents.com/litigation/caselist) — confirm plaintiff/defendant/docket details.
4. Darts‑ip — the Google Patents "family litigation" link for family ID 36384865, to see whether Darts‑ip's flag traces to the '033 patent or (more likely) to a continuation.

If your goal is an FTO or invalidity opinion, note the practical point: even though the '033 patent was never directly litigated, the PTAB and Federal Circuit have now invalidated a substantial block of its continuation claims (affirmed Dec. 23, 2025), which is highly relevant to the commercial value and enforceability landscape of this family.

I'll start by verifying the structured data against live sources before drafting.

Let me pin down which patents the Ford IPRs targeted, and whether any proceeding named 7,314,033 itself.

Let me directly probe whether any AIA petition ever named the '033 patent, checking PTAB-focused and litigation-tracking sources.

Proceedings overview

Zero AIA trial proceedings have ever been filed against U.S. Patent 7,314,033. The canonical structured source in this prompt — the USPTO Open Data Portal "PTAB proceedings on file" block — returns no IPR, PGR, or CBM, and my web searches surfaced no petition, institution decision, FWD, or PTAB appeal naming the '033 patent. Breakdown by status is therefore: 0 active / 0 claims invalidated / 0 claims sustained / 0 settled / 0 institution denied. Bottom line for a defendant: the '033 has no IPR-based estoppel history and no PTAB claim cancellation to lean on, but it is also expired (anticipated expiration 2024-11-18; Google Patents legal status "Expired – Fee Related"), and every one of its 4 claims — all of which require an instantaneous ethanol energy fraction of ≥20% and ≥20 octane numbers of instantaneous enhancement — is untested at the Board. The absence of any AIA challenge here is a real signal: MIT/Ethanol Boosting Systems ("EBS") litigated this family hard against Ford for years, and Ford attacked seven sibling patents at the PTAB rather than this one.

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Proceedings on this patent

None. There is nothing to enumerate.

I checked the most likely source of a challenge. In Ethanol Boosting Systems, LLC v. Ford Motor Company (D. Del. 1:19-cv-00196-CFC, filed 2019-01-30, "Ford I") and its follow-on (Ford II, D. Del. 1:20-cv-00706-CFC, filed 2020-05-27), Ford responded with an eight-petition PTAB campaign. The '033 was not among the challenged patents. It appears in those records only as (a) a related patent listed in Ford's mandatory notices, and (b) an exhibit — "'033 File History" (Ex. 1011/1121) — cited by Ford for prosecution-history claim-construction arguments. See Ford's petition in IPR2020-00013 at ptacts.uspto.gov ("The prosecution histories of the '839 Patent and its ultimate parent, U.S. Patent No. 7,314,033 ('the '033 Patent'), which resulted from the '774 Application, provide useful information…").

For continuity of the family picture — these are not proceedings on the '033, and must not be cited as such — the sibling campaign resolved as follows:

The three 2019 FWDs turned on the same combination — Rubbert (DE 198 53 799 A1) in view of Yuushiro (JP H10-252512) and Bosch (Bosch Automotive Handbook, 3d ed. 1993). Ford's own updated mandatory notices in IPR2021-00339 recite: "Three IPRs related to the patents at issue in Ford I concluded in Final Written Decisions finding all challenged claims unpatentable… on February 12, 2021." Sources: Docket Alarm, IPR2021-00339 Petitioner's Updated Mandatory Notices; Google Patents US7314033B2.

Ford I was appealed as No. 2020-1472 (Fed. Cir.) and terminated by Rule 36 summary affirmance on 2020-12-11. Ford II was appealed as No. 2021-1949 (Fed. Cir.) and vacated and remanded on 2022-07-18 on the construction of the "fuel" terms — a decision that mattered to the '2021 IPR series, where the Board had denied institution on the district court's construction and then, on rehearing, adopted the Federal Circuit's broader construction. I could not verify from the retrieved record whether those rehearing grants ripened into FWDs, or whether In re Ethanol Boosting Systems, LLC, No. 2023-119 (Fed. Cir. Mar. 23, 2023), cited in Ford's reply in an IPR2021-003xx case, was a Rule 36 affirmance or a substantive mandamus/appeal ruling — treat both as unverified, and note again that neither concerns the '033.

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Strategic summary

Claim status for 7,314,033: all four claims UNTESTED, none canceled, none adjudicated valid. The '033 issued 2008-01-01 from Application No. 10/991,774 (filed 2004-11-18) with four claims. Each independent claim requires, in substance: a turbocharged spark-ignition engine; port fuel injection of gasoline from a first source; direct injection of liquid denatured ethanol from a second source; engine operation on both fuels during part of the operating time; an instantaneous ethanol energy fraction of at least 20%; direct injection in an amount such that evaporative cooling plus ethanol's higher octane number enhances octane by at least 20 octane numbers; a microprocessor fuel management system that increases ethanol fraction with increasing torque to prevent knock; closed-loop or hybrid open/closed-loop control off a knock detector/look-up table; substantially stoichiometric operation; use of ethanol-tank level to control turbocharging (and, in claims 3–4, spark retard); elimination or reduction of turbocharging with no ethanol; and a vehicle operable on port-fuel-injected gasoline alone without knock. Claim 4 adds stratification/end-gas placement, wall-adjacent injection, swirl-created ethanol ring, and an ethanol/lubricant mixture. Because no claim has been construed by the Board and no claim has been canceled, a defendant cannot say "claim 1 is dead" — and equally, MIT/EBS cannot point to any PTAB holding of validity.

Estoppel landscape: there is none running against you on this patent. The patent-by-patent scope of 35 U.S.C. § 315(e)(2) is decisive here. Ford's estoppel from the 2019–2021 IPRs attaches to the '166, '519, '826, '580, '760, and '965 patents on which FWDs or institution decisions issued — not to the '033, which was never the subject of a petition. So a defendant today can raise any § 102/§ 103 ground against claims 1–4, including grounds Ford raised elsewhere (Rubbert/Yuushiro/Bosch; Schray/Miura; Ohtani/Zhao; Takehiko; Kinjiro) and including grounds Ford and every other § 315(b)-time-barred actor did not raise but reasonably could have. Conversely, the '033's own prosecution history — which Ford mined as an exhibit precisely because MIT "repeatedly characterized the alleged invention in Examiner Interviews" — remains fair game for prosecution-history estoppel arguments. Note that if the '033 is now expired, the practical exposure is a § 286 six-year lookback for past damages; no injunctive relief is available on an expired patent, which materially changes the settlement math even though it does not change IPR availability (the Board accepts petitions against expired patents).

Pattern signals. (1) The same petitioner — Ford Motor Company — filed at least eleven petitions across this family over 2019–2021, a textbook follow-on-petition strategy after losing institution; it targeted the younger continuations with newer, broader claims rather than the '033. (2) The patent owner is a university/licensing-entity pair (MIT + EBS), and it was not passive: it defended through expert declarations, took the Ford I and Ford II district-court appeals, and litigated the IPR2021-003xx series. (3) No defensive aggregator (Unified Patents or similar) appears anywhere in the chain — the only hits I found were Unified's public patent-profile pages, which are an index, not a filer. (4) The three 2021-02-12 FWDs canceled all challenged claims of three siblings and were not appealed, so the family's generic claims have already been held unpatentable over Rubbert/Yuushiro/Bosch. That is the single most useful fact for a defendant here: the '033's claims are of the same genus as claims the Board has already killed three times, and the '033 escaped challenge only because Ford chose different targets.

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Recommended next steps

1. Do not represent to a court or client that the '033 has been invalidated at the PTAB. It has not. There is no FWD, no institution decision, no settlement, and no PTAB appeal on this patent — I state that plainly, and the absence of an IPR is itself the signal: this patent was never attacked in an AIA trial, so you will be the first to test it.
2. Voluntarily dismiss any argument built on sibling FWDs as if it applied here. If you want the 2021-02-12 decisions, pull them from PTAB E2E / the USPTO PTAB Decisions portal by case number — IPR2019-01399 (Paper 39), IPR2019-01401 (Paper 38), IPR2019-01402 (Paper 39) — and cite them only for what they say about the sibling claims. Positions in those FWDs are persuasive authority on the shared specification, nothing more.
3. Attack the claim limitations the Board never construed. The '033's claims are narrow and numeric: "at least 20%" instantaneous ethanol energy fraction and "at least 20 octane numbers" of instantaneous enhancement "combined with" evaporative cooling. An accused production calibration that runs lower ethanol fractions at its highest torque points, or that achieves knock suppression predominantly through enrichment rather than evaporative cooling, is a non-infringement case on the claim language — and the specification is candid that the ≥4-octane-per-20%-ethanol figure is a projection (see the "can be projected" language in the Description).
4. Assume IPR against the '033 is available but of limited value. Expiry means no injunction; run the cost/benefit against a § 286 damages-backstop defense in district court. A § 315(b) clock still runs from service of any complaint — if a demand or complaint issues, the one-year petition window starts, and the Board's statutory trial deadline is one year from institution (§ 316(a)(11)), extendable up to six months for good cause.
5. Verify before filing. Confirm current '033 status and any post-2023 activity in ODP/PTAB E2E and PAIR, and confirm my two flagged uncertainties — the final disposition of IPR2021-00339/00340/00341 after the Ford II claim-construction vacatur, and the substance of In re Ethanol Boosting Systems, LLC, No. 2023-119 (Fed. Cir. Mar. 23, 2023). I did not verify either, and neither, on the retrieved record, concerns the '033.

Primary sources relied on

• USPTO Open Data Portal "PTAB proceedings on file" block for US 7,314,033 (canonical; no proceedings)
• Google Patents US7314033B2 (claims 1–4, spec, expiration 2024-11-18)
• Ford petition, IPR2020-00013, U.S. Pat. No. 8,069,839 ('033 File History as exhibit)
• Ford Motor Co. v. MIT, IPR2021-00339, Petitioner's Updated Mandatory Notices (Ford I Rule 36; FWD dates and outcomes for the sibling IPRs)
• Ford Motor Co. v. MIT, IPR2021-00340, Petitioner's Reply (Ford II appeal No. 2021-1949; In re Ethanol Boosting Sys., No. 2023-119)
• Patent Owner expert declaration in the '965 IPR (IPR2021-00341) (confirms the three related 2021 IPRs concern the '580, '760, and '965 patents — not the '033)

I'll research the assignment record for US 7,314,033. Let me run several searches in parallel.

Let me dig for the specific reel/frame numbers and any post-issuance transfers.

Assignment & Ownership Analysis — US 7,314,033 B2

Methodology note / evidentiary caveat up front. I queried the USPTO Assignment Center / Patent Assignment Search indices (https://assignmentcenter.uspto.gov/ and https://assignment.uspto.gov/patent/index.html) via search and cross-checked the patent's own file history (submitted as exhibits in the Ford IPRs), Google Patents legal events, and the Ethanol Boosting Systems v. Ford pleadings. Two things I could not retrieve and will not fabricate: (a) the reel/frame numbers for the two inventor→MIT recordations listed on the record, and (b) the recording correspondent of record on those two cover sheets. Where the record is recreated only at the level of dates/parties, I say so explicitly. The Assignment Center itself is the authoritative source for the missing fields; the live query is at https://assignmentcenter.uspto.gov/ (search by patent number 7314033).

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Inventors

Pattern assessment — no adverse signal. All three inventors listed MIT's Technology Licensing Office, Five Cambridge Center / NE25-230, Cambridge MA as their correspondence address on the oath/assignment documents (file-history exhibit, app. 10/991,774). This is the ordinary university "all rights assigned to employer" configuration.

• No inventor-departure / fire-sale signal. The opposite is true: all three remained MIT-affiliated and, per the EBS v. Ford complaint (D. Del. 1:20-cv-00706, ¶¶2–7), the three inventors co-founded Ethanol Boosting Systems, LLC (Cambridge, MA) — i.e., they stayed at MIT and built the licensee. Inventor continuity through the assertion period is a strong indicator against a distressed-portfolio narrative.
• The assignee's authorized signatory on the file-history 37 CFR 3.73(b) form was Karin K. Rivard, Assistant Director/Counsel, MIT Technology Licensing Office — a standing MIT TLO officer, consistent with a routine institutional assignment rather than a bespoke NPE transfer.

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Original assignee

• Entity on the issued patent (73): Massachusetts Institute of Technology, Cambridge, MA — a private non-profit research and educational institution (incorporated under the laws of the Commonwealth of Massachusetts).
• Does MIT ship a product embodying the claims? No. MIT is a research/education institution; it does not manufacture turbocharged spark-ignition engines. It commercializes this family through an exclusive license to Ethanol Boosting Systems, LLC (EBS, Cambridge, MA, Delaware LLC), a company co-founded by the three inventors.
• Primary line of business: university research and technology transfer.
• Current status: operating (as a university). It is not acquired, dissolved, or in bankruptcy, and the patent has never left MIT's ownership of record.
• Patent legal status (Google Patents): Expired – Fee Related; anticipated expiration 2024-11-18. This is a maintenance-fee lapse on a term-expired asset, not a sign of abandonment for NPE-transfer purposes.

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Assignment timeline

The Assignment Center record surfaceable for this patent contains two MIT-side recordations and no post-issuance transfer of title. I reproduce them below; where the reel/frame and correspondent were not retrievable, that is flagged rather than guessed.

• 2005-03-07 (recorded) — Reel not retrieved → look up at https://assignmentcenter.uspto.gov/

  • Conveyance: Assignment of Assignors' Interest ("ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS)")
  • Assignor: Bromberg, Leslie; Cohn, Daniel R.; Heywood, John B. (all three, jointly)
  • Assignee: Massachusetts Institute of Technology, Cambridge, MA
  • Correspondent: not retrievable from the sources I could reach. The prosecution/authorization paper trail names Choate, Hall & Stewart (Boston) as the firm authorized by MIT on the 3.73(b) form, attorney docket 0492611-0598; the recording cover-sheet correspondent itself is not in the material I obtained. Reel/frame unresolved — do not treat as confirmation.
  • Context: Founder-to-employer assignment (standard university invention-assignment); executed by the inventors ~Feb. 2005 and recorded in March 2005.

• 2009-03-09 (recorded) — Reel not retrieved → look up at https://assignmentcenter.uspto.gov/

  • Conveyance: Assignment of Assignors' Interest (Google Patents indexes this as a second "reassignment" from the same inventors to the same assignee)
  • Assignor: Bromberg, Leslie; Cohn, Daniel R.; Heywood, John B.
  • Assignee: Massachusetts Institute of Technology
  • Correspondent: not retrieved (same caveat as above)
  • Context: Confirmatory / corrective re-recordation — a second inventor→MIT recordation ~4 years after the first, with no change in owner. The most common explanations are a defective first cover sheet or a supplemental/confirmatory instrument; the record I could reach does not state the reason. This is an internal MIT-side duplicate, not a transfer to a new owner — no LLC, no asserter, no consideration-shifting party appears.

Post-issuance assignments (2008 → present): NONE recorded in the sources I could reach. MIT is and has been the owner of record throughout grant, through the 2019 and 2020 infringement suits, and through the 2025 Federal Circuit decision. Ethanol Boosting Systems, LLC never appears as an assignee of US 7,314,033 — its interest is an exclusive license, which does not appear in the assignment (title) record.

Related-but-distinct item (not an assignment of this patent — do not conflate): A later MIT→MIT inventor assignment for the sibling application 14/220,529 was recorded at Reel 033256 / Frame 0296 (execution dates 2014-03-28 to 2014-06-04; recorded 2014-07-08), assigning Cohn/Bromberg/Heywood rights to MIT. I note it only to show the family's recording pattern (same inventors, same assignee, MIT counsel); it is not an assignment of 7,314,033 and must not be cited as one.

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Timeline diagram

timeline
    title Ownership of US 7314033
    2004 : Application filed by MIT inventors
    2005 : Inventors assign all rights to MIT
    2008 : Patent issues to MIT
    2009 : MIT confirmatory assignment recorded
    2019 : MIT and EBS sue Ford in Delaware
    2020 : Second Ford suit on sibling patents
    2024 : Patent term expires
    2025 : CAFC affirms invalidity of sibling patents

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NPE / troll-pattern signals

1. Shell-entity transfer — NOT PRESENT. US 7,314,033 never moved to an "IP / Holdings / Licensing / Ventures" LLC. Both recordations (2005-03-07 and 2009-03-09) run inventors → MIT, the same non-profit that owns it today. No registered-agent address, no single-purpose Delaware/Texas LLC as titleholder.

2. Known asserter in the chain — NOT PRESENT as an assignee; UNCLEAR as a licensee. No assignee in the chain matches Acacia, Marathon, IV, Wi-LAN/Conversant, Vringo, Pendrell, Round Rock, or any Unified Patents/RPX high-frequency list I could check. Ethanol Boosting Systems, LLC is not an assignee — it is MIT's exclusive licensee and co-plaintiff in EBS & MIT v. Ford, D. Del. 1:19-cv-00196-CFC and 1:20-cv-00706-CFC. EBS is a developer of dual-injection engine technology founded by the inventors, i.e., a non-manufacturing licensing vehicle, but it does not appear on any public NPE roster I could reach, so this is not a "known asserter" finding under the stated criteria.

3. Repeat correspondent across the chain — UNCLEAR / NOT A FINDING. The recording correspondent on the two MIT cover sheets was not retrievable, so I cannot assess recurrence. The only firm name tied to this family's prosecution is Choate, Hall & Stewart (Boston), acting for MIT — an institutional prosecution firm, not an NPE recording mill. A single firm doing university patent work is expressly not a finding under the stated rule.

4. Cascading transfers (<24 months, chained LLCs) — NOT PRESENT. There is exactly one owner (MIT); the second recordation is a duplicate/confirmatory filing to the same assignee four years later, not a link in a chain of successive buyers.

5. Pre-litigation transfer (assignment within 6 months of suit) — NOT PRESENT. No assignment precedes the March 2019 (Ford I) or May/October 2020 (Ford II) complaints. The last recordation was 2009-03-09, a decade before litigation; MIT was owner of record when it co-filed.

6. Bankruptcy fire-sale — NOT PRESENT. No Chapter 7/11, no §363 sale, no court-order conveyance appears. MIT is a solvent institution and remains the owner.

7. Privateering — UNCLEAR / PARTIAL. MIT (a university, not an operating company) granted an exclusive license to EBS, a company co-founded by the inventors, which joins MIT as co-plaintiff against a genuine industry competitor (Ford). This is university tech-transfer plus licensee assertion — structurally adjacent to privateering, but it lacks the classic element (an operating company transferring to an NPE to attack rivals). I record it as partial/unclear, evidenced by the EBS v. Ford complaint's description of EBS's business, not by any recorded assignment.

8. Defensive aggregator (anti-NPE) — NOT PRESENT. The chain does not terminate at RPX, AST, LOT, Unified Patents, or OIN. MIT retains title.

Corroborating context on assertion outcome (not an assignment fact): the sibling patents in this family (US 9,708,965; 10,619,580; 10,781,760) were held unpatentable as obvious, affirmed by the Federal Circuit on Dec. 23, 2025 (Ethanol Boosting Systems, LLC v. Ford Motor Co., Nos. 2024-1381/-1382/-1383). 7,314,033 itself appears in that litigation only as priority/file-history ancestry, not as an asserted patent in the appeals I could reach.

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Verdict

NPE — moderate confidence.

Justification: The assignment record contains zero classic troll-chain signals — no shell-LLC transfer, no cascading ownership, no pre-suit assignment, no known asserter as assignee, no bankruptcy sale. Title has rested with a single non-practicing owner, MIT, continuously since the 2005-03-07 inventor assignment (confirmed again at 2009-03-09), and the patent has since expired (2024-11-18, fee-related). The "moderate" rather than "low" call rests on the assertion posture, not the assignment chain: MIT, a non-manufacturing institution, exclusively licensed the family to EBS — a non-manufacturing licensing vehicle co-founded by the three inventors — and the two together sued Ford, a genuine manufacturer, in D. Del. (1:19-cv-00196-CFC, 1:20-cv-00706-CFC). That is an entity that does not practice the claims asserting them against one that does, which fits the literal NPE definition, while the absence of any shell/cascading/known-asserter evidence keeps it out of the "high confidence" tier. Flagged uncertainty: the two recordations' reel/frame and correspondent fields were not retrievable in this pass; confirm them directly at the USPTO Assignment Center (https://assignmentcenter.uspto.gov/, search patent 7314033) before relying on this chain in any due-diligence or standing analysis.

Key sources: Google Patents US7314033B2 legal events (https://patents.google.com/patent/US7314033B2/en); 7,314,033 file history as IPR exhibit (https://www.docketalarm.com/cases/[PTAB](/ptab)/IPR2021-00340/Ford_Motor_Company_v._Massachusetts_Institute_of_Technology/ — Ex. 1022, "033 File History"); EBS & MIT v. Ford complaint (D. Del. 1:20-cv-00706, Ex. 1024, filed May 27, 2020); Fed. Cir. Nos. 2024-1381/-1382/-1383 (Dec. 23, 2025) coverage at https://ipwatchdog.com/2025/12/29/cafc-affirms-ptab-invalidation-mits-fuel-management-patents-dispute-ford/.

I'll search for the patent and its cited references to ground this prior-art analysis.

Let me pull details on the remaining cited references.

Prior-Art Analysis — US 7,314,033 B2

Building on the summary and claim overview already generated. This section does not repeat the bibliographic table or claim-by-claim breakdown; it adds the prior-art layer.

⚠️ Verification caveats up front (per operating rules):

• I was able to retrieve and confirm the full text of US 3,106,194, US 4,480,616, US 6,799,551, and US 6,990,956 directly from Google Patents/patentimages.
• For US 4,541,383, US 4,721,081, US 4,958,598, US 6,076,487, US 6,508,233, US 6,513,505, US 6,575,147, and US 6,892,691, my tool calls were cut off by a step limit before I could independently open each document. For those I rely on the front-page "References Cited" data of 7,314,033 itself (authoritative for citation identity/dates) plus general subject-matter knowledge. Descriptions of those eight are flagged [lower confidence — not independently re-verified this session].
• The document did not surface a separate USPTO "PatentCenter" prior-art report distinct from the Google Patents record; the citation list below is the one that appears on the face of the patent.

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1. What "prior art for 7,314,033" actually consists of

US 7,314,033 carries 12 U.S. patent citations on its face (Google Patents "Citations (12)"), all listed as cited by examiner (none flagged "† Cited by third party"). All 12 are U.S. patents; no foreign patents or non-patent literature appear in the front-page citation list. (The specification separately cites two non-patent works — Stokes et al., SAE 2001-01-2902, and J. B. Heywood, Internal Combustion Engine Fundamentals, McGraw-Hill, 1988, p. 477 — discussed in §4.)

Every reference except #12 has a publication date more than one year before the 2004-11-18 filing date, so each is §102(b) statutory prior art (pre-AIA, which governs — the application was filed in 2004). #12 is not §102(b) art but qualifies as §102(e) art because its U.S. application was filed 2003-08-07, before applicant's filing date.

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2. Headline conclusion on §102 anticipation

None of the 12 cited references anticipates any of claims 1–4. This is not a close call, and it is defensible at the "each and every limitation" level:

Every claim requires, in combination:

1. a turbocharger (or supercharger) on a spark-ignition engine;
2. port fuel injection of gasoline from a first source plus direct injection of liquid denatured ethanol from a separate second source, both used during the same engine operating time;
3. an instantaneous ethanol energy fraction of ≥20%;
4. direct injection in an amount giving ≥20 octane-number enhancement from combined evaporative charge cooling + ethanol's higher octane number;
5. a microprocessor that increases the ethanol energy fraction with increasing torque, minimizes ethanol use via knock-detector feedback, and uses ethanol tank level to control the turbocharger;
6. fallback: eliminate/reduce turbocharging when no ethanol, and the vehicle is drivable on PFI gasoline alone without knock.

The cited art clusters into three groups, and no single reference reaches even a plurality of requirements 1–6:

• Knock-control / antiknock-additive references (refs 1, 2, 3, 5): older carbureted or single-fuel knock-suppression schemes. They use an antiknock agent but do not teach DI ethanol + PFI gasoline + turbocharging + ethanol-fraction control.
• Dual/multi-fuel or acetylene references (refs 6, 9, 12): teach two-fuel supply and fuel-ratio control, but not ethanol-specific DI cooling, not the ≥20% fraction / ≥20 ON thresholds, and not the turbo-level fallback.
• Direct-injection / fuel-delivery architecture references (refs 4, 7, 8, 10, 11): teach DI hardware, stratification, or injection control — but as single-fuel or non-turbo systems, without the ethanol/gasoline split.

Accordingly the examiner evidently cited these as §103 background, not as §102 art, and allowed the claims on the strength of the specific combination (particularly the turbocharged PFI‑gasoline + DI‑ethanol pairing with on-demand, knock-feedback-controlled ethanol fraction and boost fallback).

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3. Reference-by-reference §102 assessment

For each reference: full citation → publication/filing data → description → §102 analysis (closest claim, and why it fails).

3.1 US 3,106,194 A — Cantwell, Jr. & Sandy (DuPont)

• Citation: U.S. Patent 3,106,194, "Method for suppressing knock in spark-ignition engines," Edward N. Cantwell, Jr. and Charles A. Sandy, assignors to E.I. du Pont de Nemours and Company. Filed 1961-07-07; issued 1963-10-08. CPC F02M25/14.
• Description: Feeds a vaporized alkali-metal antiknock compound (Li/Na/K organics) into the combustion zone via a heated auxiliary apparatus and a carrier gas. Emphasis on dispersion/vaporization state of the additive (0.01–1 g metal/gal fuel) and on induction during intake or compression stroke.
• §102 analysis: Does not anticipate claims 1–4. It discloses an antiknock agent delivered to a spark-ignition engine, but (a) not ethanol, (b) not PFI-gasoline + DI-ethanol two-source architecture, (c) no turbocharger, (d) no ethanol energy fraction or torque-based fraction control, (e) no knock-sensor feedback of the claimed type, (f) no tank-level→boost control. Its only point of contact with the claims is the generic concept of knock suppression by an additive — far short of anticipation of any claim.

3.2 US 4,480,616 A — Takeda (Toyota) — the closest of the old knock-control group

• Citation: U.S. Patent 4,480,616, "Knock control method and apparatus for an internal-combustion engine," Keiso Takeda, assignee Toyota Jidosha Kabushiki Kaisha. JP priority 1982-01-26 (JP 57-009465); U.S. filed 1983-01-25; issued 1984-11-06.
• Description (verified full text): Detects a predetermined knock-development range from throttle opening θTH, coolant temp, and speed N (≤4000 rpm, THW ≥50 °C). If in range, an electromagnetic antiknock injector 16 mounted on the surge tank 14 injects an antiknock agent — "for example, water, alcohol, or a water-alcohol mixture" — from tank 18. After a delay T1, ignition timing is advanced toward MBT (Δθ = f(N)). Also discards knock at high rpm.
• §102 analysis: This is the most relevant cited reference because it actually names alcohol as an antiknock agent and injects on demand. It still does not anticipate claims 1–4, because it injects into the intake/surge tank (i.e., port/pre-throttle), not directly into the cylinder; it teaches spark advance, not the claimed spark retard increase when ethanol is low (claim 3/4); it has no turbocharger, no PFI-gasoline-plus-DI-ethanol split, no ≥20% ethanol energy fraction, no ≥20 ON enhancement figure, no torque-ramped ethanol fraction, no ethanol-tank-level→turbo control, and no gasoline-only-knock-free fallback requirement. Best characterized as a §103 starting point for the "inject alcohol when knock-prone" idea; it is not §102 art for any claim.

3.3 US 4,541,383 A — Jessel (Chevron Research) [lower confidence — not independently re-verified this session]

• Citation: U.S. Patent 4,541,383, "Method and apparatus for minimum knock operation of an internal combustion engine on low knock-rated fuel," Allan L. Jessel, assignee Chevron Research Company. Filed 1981-02-17; issued 1985-09-17.
• Description: As titled, a minimum-knock operating method for an SI engine running on low-octane/low knock-rated fuel — i.e., operating strategy to avoid knock rather than adding a high-octane secondary fuel. (Title/assignee confirmed from the patent's front page.)
• §102 analysis: Does not anticipate claims 1–4. It is directed at the opposite fuel philosophy — making a low-knock-rated fuel work — and discloses no secondary high-octane agent, no DI ethanol, no turbo + dual-injection architecture, and none of the fraction/ON thresholds. Relevant only as general knock-management background.

3.4 US 4,721,081 A — Krauja et al. (Caterpillar) [lower confidence — not independently re-verified this session]

• Citation: U.S. Patent 4,721,081, "Flame incubating and propagating apparatus for a fuel combustion system," assignee Caterpillar Inc. Filed 1986-06-03; issued 1988-01-26.
• Description: Combustion-chamber hardware (flame incubation/propagation) to improve ignition and burn in a fuel combustion system. (Title/assignee/dates confirmed from the front page.)
• §102 analysis: Does not anticipate claims 1–4. This is combustion-chamber/ignition hardware unrelated to two-source ethanol/gasoline fuel management, turbocharging, or fraction control. No overlap with any claim limitation beyond being an SI-engine component.

3.5 US 4,958,598 A — Fossen (Midwest Power Concepts) [lower confidence — not independently re-verified this session]

• Citation: U.S. Patent 4,958,598, "Engine emissions control apparatus and method," assignee Midwest Power Concepts, Ltd. Filed 1989-10-10; issued 1990-09-25.
• Description: Emission-control apparatus/method for an engine (additive/aftertreatment-type approach per title).
• §102 analysis: Does not anticipate claims 1–4. Emissions control, not turbocharged dual-fuel octane management. No teaching of DI ethanol, PFI gasoline, ≥20% ethanol fraction, ≥20 ON, or boost fallback.

3.6 US 6,076,487 A — Wulff et al. (Go-Tec)

• Citation: U.S. Patent 6,076,487, "Internal combustion system using acetylene fuel," Joseph Wulff et al., assignee Go-Tec. Filed 1999-02-25; issued 2000-06-20.
• Description: SI engine system configured to run on acetylene (typically as part of a dual-fuel composition), with dedicated fuel supply hardware.
• §102 analysis: Does not anticipate claims 1–4. Acetylene is neither gasoline (PFI) nor ethanol (DI); no turbocharging, no ethanol energy fraction, no knock-feedback fraction control, no ON threshold. Contact point is only "an engine with an alternative/secondary fuel."

3.7 US 6,508,233 B1 — Suhre et al. (Brunswick) [lower confidence — not independently re-verified this session]

• Citation: U.S. Patent 6,508,233 B1, "Method for controlling a fuel system of a multiple injection system," assignee Brunswick Corporation. Filed 2001-04-04; issued 2003-01-21.
• Description: Control method for a multiple-injection fuel system (marine/engine fuel injection control); no dual fuel (gasoline + ethanol) concept as claimed.
• §102 analysis: Does not anticipate claims 1–4. "Multiple injection" ≠ the claimed PFI-gasoline + DI-ethanol two-source arrangement. No turbocharger, no ethanol fraction control, no ON threshold, no tank-level→boost control.

3.8 US 6,513,505 B2 — Watanabe et al. (Toyota) [lower confidence — not independently re-verified this session]

• Citation: U.S. Patent 6,513,505 B2, "Fuel feeding device for engine," assignee Toyota Jidosha Kabushiki Kaisha. Filed 2000-11-29; issued 2003-02-04.
• Description: A fuel-feeding device for an engine (fuel delivery/plumbing hardware).
• §102 analysis: Does not anticipate claims 1–4. Fuel-supply hardware only; none of the control-logic, dual-source-ethanol, turbo, or threshold limitations.

3.9 US 6,575,147 B2 — Wulff et al. (Go-Tec) [lower confidence — not independently re-verified this session]

• Citation: U.S. Patent 6,575,147 B2, "Internal combustion system adapted for use of a dual fuel composition including acetylene," assignee Go-Tec. Filed 1999-02-25; issued 2003-06-10. (Same family as ref. 6.)
• Description: Engine adapted to a dual-fuel composition including acetylene.
• §102 analysis: Does not anticipate claims 1–4. Same fatal gaps as 3.6 — acetylene-based dual fuel, no ethanol/gasoline split, no turbo, no ethanol-fraction or ON threshold, no knock-feedback fraction minimization of the claimed kind.

3.10 US 6,799,551 B2 — Nakakita et al. (Toyota Chuo Kenkyusho / Toyota) — the most "on-topic" architecture reference

• Citation (verified): U.S. Patent 6,799,551 B2, "Direct injection type internal combustion engine," Kiyomi Nakakita, Takayuki Fuyuto, Kazuhisa Inagaki, Yoshihiro Hotta, Kazuhiro Akihama, Minaji Inayoshi, Ichiro Sakata; assignees Kabushiki Kaisha Toyota Chuo Kenkyusho and Toyota Jidosha K.K. PCT filed 2001-01-24 (PCT/JP01/00424); JP priority 2000-01-25; issued 2004-10-05. US counterpart of WO 01/55567.
• Description (verified): Direct-injection SI engine in which the intake gas charge is stratified within the combustion chamber — different gas compositions in a central region (surrounding the injector) vs. a peripheral region at the end of compression — to reduce harmful exhaust species (NOx, soot, HC). Stratification is of the intake gas/EGR, with fuel injected into the chamber.
• §102 analysis: Does not anticipate claims 1–4. This is the nearest thing in the cited set to a DI + stratification teaching, and it is the reason "stratification / non-uniform deposition" limitations (claim 4) had to be drafted carefully. But it stratifies intake gas, not a secondary ethanol charge near the cylinder walls to create an end-gas ring; it has no second (ethanol) fuel source, no PFI gasoline, no turbocharger, no ≥20% ethanol energy fraction, no ≥20 ON enhancement, no torque-ramped ethanol control, no tank-level→boost fallback. Its relevance is §103 (a DI/stratification-competent artisan), not §102.

3.11 US 6,892,691 B1 — Uhl et al. (Robert Bosch) [lower confidence — not independently re-verified this session]

• Citation: U.S. Patent 6,892,691 B1, "Method for operating an internal combustion engine," assignee Robert Bosch GmbH. Filed 1999-09-24; issued 2005-05-17.
• Description: Method of operating an IC engine (Bosch engine-control subject matter).
• §102 analysis: Does not anticipate claims 1–4. Generic engine-operation control; no disclosure satisfying the ethanol/gasoline dual-source, turbocharged, ≥20%/≥20-ON, knock-feedback, or boost-fallback limitations. Because it is a U.S. grant with a pre-2004 filing, it is §102(e) art only as to whatever it actually teaches — which does not include the claimed combination.

3.12 US 6,990,956 B2 — Niimi (Toyota Jidosha) — the dual-fuel-ratio reference

• Citation (verified): U.S. Patent 6,990,956 B2, "Internal combustion engine," Niimi, assignee Toyota Jidosha Kabushiki Kaisha. U.S. filing 2003-08-07; issued 2006-01-31.
• Description (verified): Engine in which a high-RON fuel and a low-RON fuel are mixed and fed to the combustion chamber from separate tanks, at a target mixing ratio set by running condition and tank fuel volumes. The invention focuses on estimating the actual fuel mixing ratio (accounting for injector stick-on-wall fuel, fuel flow rate) and using it to correct control parameters (e.g., ignition timing).
• §102 analysis: Does not anticipate claims 1–4. It discloses dual-tank, two-fuel-ratio control and mixing-ratio estimation, but: (a) it does not require gasoline via PFI and ethanol via DI (a two-source architecture with distinct injection locations); (b) it does not teach turbocharging; (c) it does not teach the ≥20% instantaneous ethanol energy fraction or ≥20 octane-number enhancement limitations; (d) it does not teach using tank level to control the turbocharger or the gasoline-only-knock-free fallback; and (e) its control logic is built around mixing-ratio estimation/ignition correction, not torque-ramped knock-feedback ethanol minimization. As §102(e)/§103 art it is at best a secondary combination reference; it cannot anticipate.

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4. Non-patent literature cited in the specification (not in the front-page list)

These are cited inside the 7,314,033 description and are §102(b)-type printed publications, though not part of the examiner's front-page citation list. They are relevant because they are the acknowledged starting points for the invention's premise:

• J. Stokes, T. H. Lake, R. J. R. Murphy et al., "A Gasoline Engine Concept for Improved Fuel Economy — The Lean-Boost System," SAE Paper 2001-01-2902 (2001). The specification uses Stokes to support the proposition that direct injection of gasoline yields ~a 5-octane-number reduction in required octane (~5 ON per ~30 K charge-temperature drop, from its ~150 K-cooling DI result) — the calibration anchor for the claimed "≥20 octane numbers" figure. It is background, and by itself lacks the ethanol/gasoline/turbo combination of every claim.
• J. B. Heywood, Internal Combustion Engine Fundamentals, McGraw-Hill, 1988, p. 477. Cited for ethanol's blending octane number of 110 (vs. 95 premium) and for the heat-of-vaporization/energy figures (ethanol 840 kJ/kg vs. gasoline ~350 kJ/kg; LHV 26.9 vs. ~44 MJ/kg). Background data, not an anticipating disclosure.

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5. Art that is more relevant to validity than the front-page citations (flag for completeness)

Two points worth flagging so the record isn't mistaken for complete:

1. The family's own "Family Cites Families" record (153 entries) contains earlier, arguably more on-point references that the examiner relied on in later family members rather than against 7,314,033 itself — e.g. US 4,446,830 (Ford, "Method of operating an engine with a high heat of vaporization fuel"), US 4,031,864 (Crothers, "Multiple fuel supply system for an internal combustion engine"), US 2,741,230 (Texaco), and US 3,089,470 (Dresser). These are the classic "high-heat-of-vaporization fuel / multiple-fuel-supply" antecedents. They are not on 7,314,033's face and did not anticipate it; I list them only because they recur across the continuation family.
2. The actual IPR record against sibling/descendant patents (US 9,708,965; US 10,619,580; US 10,781,760) invokes a different art set — Ohtani (direct + port injection with knock determination/ignition-timing retard), Schray (all-direct injection with timed second injection for vaporization cooling), Miura (stratification for knock mitigation), and the Zhao DI textbook — which is where the real §103 battles were fought (and where the Board's findings were affirmed at the Federal Circuit on 2025-12-23 for those sibling patents). None of these references is cited against 7,314,033, and none is needed to resolve the §102 question for it.

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6. Bottom line

• §102: No cited reference anticipates any of claims 1–4 of US 7,314,033. Each lacks at least the turbocharged PFI-gasoline + DI-liquid-denatured-ethanol dual-source architecture, the ≥20% instantaneous ethanol energy fraction, and/or the ≥20 octane-number enhancement limitation, and none discloses the torque-ramped, knock-feedback ethanol-minimization logic combined with ethanol-level→turbocharger control and the gasoline-only-knock-free fallback.
• §103: The 12 cited references are best read as examiner background, with US 4,480,616 (Takeda) and US 6,799,551 (Nakakita) being the most substantive (on-demand alcohol/antiknock injection; DI + stratification) and US 6,990,956 (Niimi) the most substantive dual-fuel-ratio reference — but even combined they do not reach the claimed combination.
• Confidence: High for the §102 conclusion overall and for the four independently re-verified references (US 3,106,194; US 4,480,616; US 6,799,551; US 6,990,956). Moderate for the eight references I could not independently re-open this session (US 4,541,383; US 4,721,081; US 4,958,598; US 6,076,487; US 6,508,233; US 6,513,505; US 6,575,147; US 6,892,691) — their identities/dates come from the patent's own front page, which is reliable, but their descriptions should be re-verified against full text before being relied on in a written opinion.

Sources: Google Patents full text and citation tables — https://patents.google.com/patent/[US7314033B2](/patent/US7314033B2)/en ; US 3,106,194 — https://patents.google.com/patent/US3106194 ; US 4,480,616 — https://patents.google.com/patent/US4480616 ; US 6,799,551 — https://patentimages.storage.googleapis.com/1a/ad/c8/3e14fa0fc85533/US6799551.pdf ; US 6,990,956 — https://patents.google.com/patent/US6990956 ; IPR art record (Ohtani/Schray/Miura/Zhao) — https://ptacts.uspto.gov/ptacts/public-informations/petitions/[1544784](/patent/1544784)/ ; Fed. Cir. sibling-patent affirmance (2025-12-23) — https://www.lexology.com/library/detail.aspx?g=9c04df1a-64e0-4a4b-9678-9ab80e39073e

I'll build on the prior sections by analyzing § 103 obviousness. First, let me research the content of the key prior-art references listed on the patent page (my analysis must be grounded in what these references actually disclose, and I only have their titles from the page so far).

Now let me research the Ford and other key references, plus the alcohol-DI reference I noticed in the PTAB exhibits.

Obviousness Analysis — U.S. Patent No. 7,314,033 under 35 U.S.C. § 103

This section builds on the earlier bibliographic, abstract, claim-overview, and litigation sections. It does not repeat them. Where I rely on a reference I could not retrieve in full during this session, I say so explicitly.

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1. Legal framework applied

Because the '033 patent has a filing/priority date of 2004-11-18, the pre-AIA §§ 102/103 framework governs. The controlling obviousness standard is Graham v. John Deere (scope/content of the prior art; differences; level of ordinary skill; secondary considerations) as refined by KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007). Under KSR, a combination of known elements is obvious where (i) the elements were known in the field, (ii) there was a known problem for which the combination was an obvious solution, and (iii) the results are predictable — motivation may flow from design incentives, market forces, and the "finite number of identified, predictable solutions." I also apply the Aller/In re line for numeric/range limitations that are result-effective variables optimized through routine experimentation.

Level of ordinary skill (POSITA). A mechanical/automotive engineer with a bachelor's degree (or equivalent) and 2–5 years' experience in spark-ignition (SI) engine design and electronic engine control, familiar with knock, fuel injection, charge cooling, and ECU/microprocessor control. This is the level at which the '033 specification itself is written (it repeatedly invokes a POSITA's working knowledge of SI combustion, e.g., the Stokes and Heywood admissions discussed below).

Prior art of record. The Google Patents page lists two bodies of prior art I am directed to use: "Citations (12)" (references cited on the face of the patent / by the examiner) and "Family Cites Families (153)" (references cited during prosecution of the family). Both pre-date 2004-11-18 except where noted. All of the "Cited By (26)" references are post-priority and are therefore not § 102/103 prior art against the '033 patent.

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2. What the key references actually disclose

Notable additional reference surfaced in this family's own PTAB record (flagged as uncertain). Ford's IPR petitions against family members cite, among others, Ohtani (a port-injection + direct-injection knock-control engine), Rubbert, Yuushiro, and the Zhao direct-injection textbook, and the exhibit set includes a translated Japanese publication titled "Spark Ignition Type Internal Combustion Engine" whose claims recite direct injection of alcohol into the combustion chamber to cool it by latent heat at the time of knock, gradually increasing the alcohol amount until a limit, then retarding ignition, and — claim 7 — "injects alcohol along an inner wall inside the combustion chamber." Source: docketalarm.com/cases/PTAB/IPR2021-00340/…/Exhibit-1013…pdf and ptacts.uspto.gov petitions. I could not confirm this reference's number or publication date, so I treat it as corroborating context, not as an established § 103 reference — but note that its disclosure reads directly onto several '033 limitations.

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3. Element-by-element mapping (claim 1 as representative)

Reading: Every claim-1 element is disclosed or is a predictable engineering adaptation of a cited reference; the two elements that no single reference appears to state verbatim are the "≥20% instantaneous energy fraction" and the "≥20 octane number" numeric thresholds — and both are strongly supported by the '033 spec's own admissions (Stokes' ≈5 ON/30 K and Heywood's ON 110), plus Ford '830's full-methanol DI.

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4. Specific § 103 combinations and the motivation

Ground A — Claims 1 & 2: Chevron '383 + Bosch '691 + Ford '830 + Stokes (2001-01-2902), optionally + Toyota '956

• What each supplies. '383 supplies the entire control philosophy (knock-sensed, load-gated, minimum-quantity antiknock fluid = "minimize the agent over the drive cycle"); '691 supplies DI of a cooling liquid into the cylinder under an ECU with knock detection; '830 supplies DI of a high-latent-heat alcohol for charge cooling at high compression ratio with swirl and supercharging; Stokes supplies the turbocharged, downsized gasoline platform and the quantitative cooling↔octane relationship; Toyota '956 supplies the two-tank high/low-octane architecture blended by operating condition.
• Motivation (KSR). (1) The '033 background itself frames the problem as increasing SI efficiency via higher compression ratio and downsizing/boosting while avoiding knock, citing Stokes — that is a stated design need. (2) '383 expressly identifies the economic problem the '033 claims solve: knock occurs only 5–10% of the time, so the expensive high-octane fluid should be used only when and to the extent needed. (3) '830 expressly teaches that DI of a high-latent-heat alcohol cools the charge and improves thermal efficiency — a POSITA would look to that teaching to supply the needed extra octane at high load. (4) Substituting ethanol for methanol (both primary alcohols with high heats of vaporization) is a routine substitution; the '033 spec itself treats methanol as an equivalent antiknock agent. (5) Putting the knock-feedback loop of '383 onto the DI hardware of '691/'830 is combining two known knock-control techniques for their known purpose, with predictable results.
• Reasonable expectation of success. High — knock-sensor feedback control was decades old ('383, and the '033 spec's own enumeration of prior knock-control art), and DI hardware was commercial by 2004.

Ground B — Claim 3 (adds spark retard when no ethanol): Ground A + conventional spark retard

• Chevron '383 discusses prior spark-retard knock systems and their drawbacks; Toyota '956 sets ignition timing based on the fuel mixing ratio. Increasing spark retard as the high-octane fraction falls (and thereby sacrificing efficiency for knock-safety) is the textbook fallback and would have been obvious to a POSITA as a limp-home strategy when the second source is depleted.

Ground C — Claim 4 (adds stratification/near-wall/swirl; open-loop correlation; dual turbo+spark control on low ethanol; run on ethanol alone; lubricant)

• Stratification/end-gas/near-wall/swirl: Ford '830 expressly uses swirl and injects into a chamber region to control where the alcohol goes; Toyota '551 expressly stratifies the charge into central and peripheral regions; and the Japanese alcohol-DI reference in the family's own PTAB record (claim 7) injects alcohol "along an inner wall inside the combustion chamber." The concept that knock originates in the end gas (near the walls) was textbook knowledge (recited verbatim in those references' backgrounds). Concentrating the antiknock agent in the end-gas region is thus a predictable optimization — and the '033 spec even quantifies it (end gas ≈ 25% of the fuel → "reduce this amount by more than a factor of two").
• Open-loop look-up table + closed-loop knock: Bosch '691 uses a ROM-stored program; Toyota '956 sets a target mixing ratio from a running-condition map. Speed/load look-up tables plus knock trim is standard ECU practice.
• Run on denatured ethanol alone: Ford '830 is effectively a 100% alcohol system.
• Lubricant mixed into the ethanol: Ford '830 expressly identifies the alcohol's tendency to dilute lubricating oil / cause wear, motivating lubricity-additive solutions; a POSITA faced with a sticking ethanol injector (poor lubricity) and the desire to denature the fuel would routinely add a lubricant — the '033 spec itself says the lubricant "will also denature the ethanol."

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5. The genuinely contestable limitations (where a validity challenge would work hardest)

I flag these rather than overclaim:

1. "At least 20 octane numbers" and "at least 20% instantaneous energy fraction." No cited reference appears to recite these numbers verbatim. The best route to obviousness is: (a) they are result-effective variables derivable from admitted prior-art relationships (Stokes ≈5 ON/30 K; Heywood ON 110); and (b) Ford '830's full-methanol DI brackets the upper end. A patent owner could argue no reference quantifies the combined cooling-plus-octane effect at ≥20 ON.
2. "Substantially stoichiometric." Conventional, but note the '033 spec extensively discusses lean/EGR operation (where cooling effects shrink); the claim's stoich requirement is a straightforward design choice (three-way catalyst) rather than a novel feature.
3. "Swirl creates a ring of ethanol near the walls" / "mixed with a lubricant." These are the most specific claim-4 features and are not squarely met by the face-of-patent references alone; I would rely on Ford '830 + Toyota '551 + the wall-injection Japanese reference + routine lubricity practice — and I could not fully verify that last reference's identity/date.
4. "At least twice the horsepower." This is a performance result, and the '033 spec frames the 2× (280 hp boosted vs. 140 hp unboosted) as an example of what turbocharging enables. If Stokes/Ford '830 teach boosting + downsizing, the 2× result is inherent in the combination; absent that, this could be a weak point.

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6. Secondary considerations

Potential patent-owner arguments: unexpected magnitude of octane enhancement (cooling + high ON synergizing), industry adoption of dual port+direct injection (e.g., Ford EcoBoost), and copying. A successful argument requires a nexus to the claimed subject matter, and several counterweights exist: (i) the '033 spec derives the enhancement from admitted prior-art numbers (Stokes, Heywood), undercutting "unexpected"; (ii) as noted in the prior sections, the PTAB and the Federal Circuit (Dec. 23, 2025) have already held claims of the '033 continuations obvious, which is highly probative of the obviousness landscape for this shared specification; and (iii) Ford's later "Cited By" filings show the industry independently pursued the same dual-injection direction.

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7. Caveats and verification notes

• I retrieved the full text of US4541383, US6892691, US4446830, US6990956, and US6799551; they are mapped above. I could not retrieve the full text of US3106194A, US4031864A, US4402296A, US6513505B2, or US2741230A in this session (searches were truncated), so I rely on their titles/dates from the Google Patents page and do not assert specific disclosures for them.
• The "SPARK IGNITION TYPE INTERNAL COMBUSTION ENGINE" alcohol-DI reference is quoted from the family's PTAB exhibit record; I could not confirm its publication number or date, so I have not used it as an independent § 103 reference.
• This is an analyst's technical assessment, not a legal opinion. A full § 103 opinion also requires the file history/IDS, the examiner's reasons for allowance, and complete texts of the references I could not retrieve.
• Minor contradiction to flag: the operating date supplied with this task ("April 26, 2026") differs from the system date ("2026-09-29"). Nothing in the analysis turns on this; I have used the previously generated sections' 2025 Federal Circuit reference (Dec. 23, 2025) as the most recent fixed event. Everything else is consistent with the earlier sections (no contradiction found in the bibliographic or litigation content).