US 159872

I'll run targeted searches for this specific patent number and check for any litigation/docket activity.

Let me try more specific searches, including the CAFC docket angle.

Summary: US Patent 159,872

Bottom line: I found the patent record for US159872 (title: "Improvement in parlor-fountains"), but I found no CAFC 2026 docket activity, and no litigation at all, for this number. Searches for "159872" returned only unrelated documents (a Hungarian patent 159872 on polyurethanes; PCT publication WO2016/159872 on motion control) — those are not the same patent and I have not conflated them. No separate USPTO PatentCenter/Assignment or CAFC record surfaced.

---

Bibliographic data

Abstract

There is no abstract. US patents issued in 1875 did not carry abstracts — the abstract requirement is a 20th-century practice. The Google Patents page shows a curated "Definitions" digest, which is not a legal abstract. Its substance:

A = basin, divided by diaphragm B, connected to base-chamber C by waste-pipe D and air-pipe D1. Air is forced by the upward pressure of water in base C, through pipe D1, over the water in the chamber below diaphragm B, and by its compressive force ejects the liquid through nozzle E. The ejected water falls back into the basin and is carried by pipe D into the base.

In short: this is an air-pressure (pneumatic) tabletop fountain — no pump-driven jet in the base concept; the water column in the base chamber compresses air, which drives the jet.

The claim (there is exactly one claim — the sole independent claim)

As printed:

"A pump, F, arranged in the base-chamber, C, and connected by pipe D2 with the lower chamber of the fountain A B, the latter being provided with the usual Waste-pipe D, air-pipe D1, and ejecting-nozzle E, as and for the purpose specified."

Plain language: The claim is a combination claim covering the known parlor-fountain structure (basin A + diaphragm B, base chamber C, waste-pipe D, air-pipe D1, ejecting nozzle E) in combination with a pump F mounted in the base chamber C and connected by a pipe D2 to the fountain's lower chamber (the space beneath diaphragm B).

Key points:

• It is the only claim — there are no dependent claims, so claim-construction scope is entirely a function of this single combination.
• The specification is explicit that the fountain body itself is old ("This is all old"), so novelty resides solely in the added pump F + pipe D2 sub-combination. That makes the claim vulnerable to an anticipation/obviousness attack premised on a prior fountain plus a known pump — consistent with its very narrow grant.
• OCR gap: the specification sentence "with this I combine a suitable pump, F, which is preferably oper-" is truncated in the record. What the pump is "preferably operated" by (hand, gearing, etc.) is not recoverable from the authoritative text — I will not guess.

Related art in the same field (for context, not the same patent)

• US183,163 — John Hegarty, "Improvement in Parlor-Fountains," issued Oct. 10, 1876 (weighted-piston parlor fountain). Different invention, different number.
• US149,254 — C. H. Schultz, soda-fountain improvement, 1874 (the subject of a validity/infringement suit in 350 F. Rep. — not this patent).

Litigation / CAFC 2026 dockets

None found, and none plausible. Two independent reasons:

1. Date: the patent expired February 16, 1892. It has been unenforceable for ~134 years, so it cannot support a 2026 infringement action.
2. Forum: the Court of Appeals for the Federal Circuit did not exist until 1982, so no CAFC docket can involve this patent.

My searches of general web/CAFC-news sources for "159872" in 2026 docket contexts returned zero relevant hits.

Confidence and uncertainty

• High confidence in the bibliographic data, title, inventor, filing/issue dates, and the single-claim text — all taken directly from the authoritative full text you supplied, which I preferred over search results.
• Explicitly uncertain: (a) the truncated "preferably oper-" clause in the specification; (b) the absence of an assignee — I can only say none is named in the record, not that no assignment was ever recorded, since I could not retrieve the USPTO Assignment database entry for this number.
• No authoritative abstract exists for this patent; anyone supplying one is reconstructing it.

I'll search for litigation involving US patent 159872.

Let me run additional targeted checks on litigation-specific sources.

Let me do a final set of checks on litigation databases and any historical enforcement.

Bottom line

No litigation involving U.S. Patent No. 159,872 ("Improvement in Parlor-Fountains," Herman Wenzel, granted February 16, 1875; application filed December 5, 1874) was found. This is a negative finding, not a certification that no case ever existed — see the caveats at the end.

What US 159,872 actually is (for identity verification)

Source: https://patents.google.com/patent/[US159872](/patent/US159872)/en

Searches performed

I searched the open web for litigation on this patent number, including litigation-oriented aggregators and docket material surfaced through CourtListener-hosted RECAP PDFs and the RPX Insight litigation document repository, plus keyword combinations tying the number to "patent," "lawsuits," "infringement," "Wenzel," and "fountain."

Verified non-matches (excluded false positives)

Every hit for the string "159872" / "'872 patent" in the searches traced to a different identifier. Recording these so the same dead ends are not re-run:

Why a negative result is expected here

1. The patent expired February 16, 1892 — over 134 years ago. It is not an assertable right today.
2. Modern litigation databases do not reach it. Unified Patents' litigation portal, Docket Navigator, and RPX Insight are populated from PACER and similar electronic records, which are effectively complete only from the 2000s forward (PACER itself begins in the late 1980s/early 1990s). A pre-1892 case would not appear in them even if one had been filed.
3. Pre-1892 patent suits were litigated in the federal circuit courts under the Patent Act of 1870 and are reported (inconsistently) in Federal Reporter predecessor volumes, the Official Gazette, and the Commissioner of Patents' annual reports — sources that are not indexed by the litigation aggregators named in your instructions. I did not locate any such report naming this patent.

Caveats on this finding

• I could not query the Uniform Patents litigation case list, Docket Navigator, or PACER directly; my searches went through a general web index. A PACER/aggregator query for "159872" would only return modern cases, and none of the modern "159872"/"'872" hits correspond to this patent.
• Absence of a hit in web-indexed sources is not proof of absence of a historical suit. If you need a definitive negative for the 1875–1892 enforcement window, the check would have to be run against the printed Federal Reporter / circuit court reports and the Patent Office's annual litigation lists for those years — none of which surfaced in these searches.
• No case number, court, plaintiff, defendant, or outcome can be reported, because no case was found. I will not construct one.

Recommendation: treat US 159,872 as a litigation-free (and long-expired) reference patent. Its only modern relevance is as a prior-art/citation document (cited by US 2,938,495) and as a classification-B05B 17/08 fountain art reference, not as a litigation asset.

I'll verify the structured data against live sources before writing.

Proceedings overview

Total AIA trial proceedings on US 159,872: zero. The USPTO Open Data Portal structured block returns no IPR, PGR, or CBM proceedings, and independent web checks against PTAB petition documents and CourtListener surfaced nothing — no active trials, no claims invalidated in an AIA forum, no claims sustained, no settlements, no institution denials, no Federal Circuit appeals. The bottom-line defensive posture is not "hardened patent" or "dead claims" but something more fundamental: there is no live patent to defend against. US 159,872 issued 1875-02-16 on an application filed 1874-12-05, and its term expired 1892-02-16 (Google Patents records the status as "Expired - Lifetime" with an anticipated expiration of 1892-02-16). A defendant receiving a demand letter citing this patent is not facing a validity fight — they are facing a document that has been in the public domain for roughly 134 years.

Because there are no proceedings to walk through, the standard per-proceeding template is inapplicable. Below I substitute the two things that actually matter for a defendant: (A) why no PTAB proceeding can exist here, and (B) a name-collision warning, because searching for "IPR '872 patent" will return other, unrelated patents and a defendant could easily brief the wrong record.

---

No proceedings — and why that is a structural certainty, not an accident

• Type: N/A (no Inter Partes Review, Post-Grant Review, or Covered Business Method review on file)
• Filed: N/A
• Status: N/A — no proceeding exists. The patent's own legal status is "Expired - Lifetime," anticipated expiration 1892-02-16.
• Judge panel: N/A. The Patent Trial and Appeal Board did not exist during the patent's enforceable life.
• Petition grounds: N/A
• Institution decision: N/A
• Final Written Decision: N/A
• Settlement / termination: N/A
• Appeal: N/A — no PTAB decision to appeal, and no Federal Circuit (established 1982) or Court of Customs and Patent Appeals record tied to this patent surfaced in search.
• Defensive value: Absolute. There is no claim of US 159,872 to assert, cancel, or construe. The only defensive work required is confirming the demand letter is not actually pointing at a different patent that happens to share the last three digits.

The structural reason. The Leahy-Smith America Invents Act was signed 2011-09-16, and the IPR, PGR, and CBM provisions became effective 2012-09-16 — the same date the PTAB was created. That is 120 years after this patent's term expired and 136 years after it issued. No AIA trial could ever have been filed against US 159,872, because the forum did not exist while the patent was in force. Even the older administrative vehicles are empty: ex parte reexamination (35 U.S.C. §§ 301–307) was not created until the 1980 Reexamination Act, and inter partes reexamination arrived in 1999 — decades after expiry. The only contemporaneous challenge route would have been a federal court validity defense in a suit brought before 1892, and search surfaced no pre-1892 litigation record. Nothing had to be decided here; the patent simply ran out.

---

⚠️ Name-collision warning — do not brief the wrong '872

Web searches for "872 patent IPR" return a large volume of PTAB material about entirely different patents that are informally cited by their last three digits. Two concrete false positives surfaced in this search:

1. A "'872 Patent" with claims 1–39, a "user verification module," an "assignment" limitation, and a priority chain through applications 11/020,459 and 10/998,691 to a 2005-02-04 filing date. This is a modern patent (2024-era IPR petition art, per the PTAB petition PDF at ptacts.uspto.gov, petition 1461369). It has nothing to do with a fountain. The petition even discusses § 120 priority and § 112 written-description support — statutory frameworks that postdate US 159,872's expiry by over a century.
2. A "'872 Patent" litigated by Cisco Systems involving modulators and optical signal intensity, with claims 1 and 15 and a co-pending declaratory judgment action (Answer and Counterclaim filed 2022-02-07) — PTAB petition 1549157, applying Apple v. Fintiv, IPR2020-00019, Paper 11 (PTAB 2020-03-20), and § 325(d). Again, a different patent entirely.

Neither petition challenges US 159,872. Both are short-form "'872" references to patents in the 7-, 8-, or 9-million series. If a demand letter or a defendant's own prior-art search cites "the '872 patent," verify the full number before relying on any PTAB outcome. Citing a Cisco IPR or an IPR on a 2005-priority patent as authority about US 159,872 would be a sanctionable misstatement of the record.

---

Strategic summary

Claim-by-claim status. US 159,872 has exactly one claim, and it was never the subject of any PTAB validity determination. Its claims are not "canceled," not "sustained," and not "untested" in the PTAB sense — those categories describe AIA outcomes, and no AIA forum ever had jurisdiction over a patent that expired 1892-02-16. The correct characterization is that all claims are expired and in the public domain. The claim as printed recites the combination of a pump F arranged in base-chamber C and connected by pipe D² to the lower chamber of the fountain, the basin A being provided with the usual waste-pipe D, air-pipe D¹, and ejecting-nozzle E. The specification itself concedes that the air-forcing/waste-pipe arrangement "is all old" and that the invention lies in the pump combination — a bit of self-inflicted prior-art framing that would have been unhelpful had the patent ever been litigated. It was not.

Estoppel landscape. 35 U.S.C. § 315(e)(2) estoppel is irrelevant and nonexistent here. Estoppel attaches only to a petitioner who obtained a final written decision in an IPR, PGR, or CBM. No FWD exists, no petitioner exists, so no party is estopped from anything. For a defendant currently being asserted against, the entire universe of prior-art grounds is "still available" in a purely academic sense — but there is no need to use any of them, because non-infringement and unenforceability defenses are unnecessary when the asserted right has been extinct since 1892. The patent's death is the strongest possible defense and it costs one line.

Pattern signals. None of the usual PTAB tells apply. There is no serial petitioner, no defensive aggregator (Unified Patents did not exist and has no interest in a fountain), no patent owner pressing appeals, and no parallel district court campaign. The only third-party citation activity on file is forward citation: US 2938495A (Hinton, "Bird bath," filed 1957-08-07, granted 1960-05-31) cites US 159,872. That is a 1960 bird-bath patent drawing on 1875 fountain architecture — evidence that the disclosure became free prior art, not evidence of litigation. The "Similar Documents" list on Google Patents (US 191,346 aerated-water fountains; US 143,456 fountains and aquariums; a long run of ejector-pump and injector patents) is a citation-graph artifact, not a proceeding list.

---

Recommended next steps

• If you are a defendant: Do not budget for an IPR. Instead, check the year on the face of any asserted patent number. If the assertion truly targets US 159,872, the dispositive facts are the grant date (1875-02-16) and the expiry (1892-02-16), both recorded on the authoritative source at https://patents.google.com/patent/US159872/en. A patent whose term lapsed in 1892 cannot support an infringement claim, and a demand built on it is a candidate for a Rule 11 or § 285 fee motion rather than an invalidity case.
• Confirm the number, not the nickname. Before responding, verify whether the demand letter's "the '872 patent" is actually US 159,872 or one of the modern patents deflected above. If it is a modern 7/8/9-million-series patent, the real PTAB record exists and this memo is the wrong one — pull the correct proceeding directly from USPTO PTAB E2E / PTAB Decisions and the PTAB public-information petitions portal.
• If you are searching for activity that does not exist: state it plainly. There is no institution-decision deadline to calendar, no oral hearing, no statutory one-year FWD clock, and no § 315(b) one-year bar to watch — none of those clocks ever started, because the PTAB's jurisdiction began 2012-09-16 and this patent's enforceability ended 1892-02-16.
• On the "absence of IPRs is a signal" heuristic: it does not apply here. The usual inference — that a heavily asserted patent would eventually draw IPRs — presupposes a live patent. For US 159,872 the absence of PTAB activity is not a defensive gap; it is the expected and permanent state of a 19th-century patent in the public domain.

Confidence note: I have high confidence that no AIA trial proceeding exists against US 159,872, based on the authoritative ODP block plus negative searches. I did not locate — and do not claim to have located — any definitive pre-1892 district court litigation record; historical federal case reporting from that era is not comprehensively digitized, so I flag that as an open (and, for defensive purposes, immaterial) gap rather than assert its absence with certainty.

Scope note

I searched the USPTO Assignment Center surface (assignmentcenter.uspto.gov), its legacy index (assignment.uspto.gov), and the open web for any recorded assignment, reel/frame, or correspondent tied to US 159,872. I found none. Per the task instruction, I state that plainly here — but because you also require a verdict and a signal-by-signal call, I have completed those sections as well, marked where a signal is inapplicable rather than merely unevidenced. If you want the strict "stop after the timeline" reading, sections below the timeline can be truncated.

---

Inventors

Unusual patterns: None detectable. The departure-within-12-months heuristic cannot be evaluated, because the patent never entered a corporate portfolio. There is also no evidence that Wenzel ever assigned this patent at all — a solo inventor of an 1875 tabletop fountain, with no corporate owner to depart from.

Do not conflate: Paul Goepel and T. B. Mosman appear in the record as witnesses to the specification, not as inventors and not as assignment correspondents. A "Paul Goepel" was active as a New York patent attorney in this era, but I cannot confirm that identification with high confidence, and in any event witnessing an 1875 specification is not a recorded-assignment role. Flagging this because it is the single most likely point of confusion in this file.

---

Original assignee

None. The patent issued directly to Herman Wenzel as an individual.

• Entity named on the issued patent: no assignee named. The grant runs to Wenzel.
• Product embodying the claims: The specification describes the article itself (a pneumatic parlor fountain, basin A divided by diaphragm B, base chamber C, waste-pipe D, air-pipe D1, nozzle E, plus the claimed pump F and pipe D2). Whether Wenzel manufactured and sold it is not established by any source I could retrieve — no trade catalog, no 1875–1892 advertising, no obituary or business notice. I will not assert a product line.
• Primary line of business: unknown.
• Current status: dead as a legal right. Expired 1892-02-16. There is no operating entity, no successor-in-interest identified in any record, and no acquisition, dissolution, or bankruptcy event on file. Any entity that might have succeeded to Wenzel's business in the 1870s–1890s is untraceable from this record, and would in any case have lost all rights 134 years ago.

---

Assignment timeline

The USPTO Patent Assignment Search returns no records for US 159,872. There are no reel/frame entries, no conveyance types, no assignors, no assignees, and no correspondent of record to report.

Two independent reasons, both expected and neither anomalous:

1. Procedural. The reel/frame assignment index is a 20th-century artifact. The modern "correspondent of record" field exists only because recordings are filed by attorneys through EPAS/ETAS/Assignment Center (electronic from the 1990s; paper reel/frame records effectively from the 1950s). A patent granted 1875 and expired 1892 predates the entire indexing scheme. Absence of a record here is not evidence of absence of a long-forgotten paper assignment — it is evidence that the paper trail, if any existed, was never digitized.
2. Rights. The patent term ended 1892-02-16. There has been nothing to assign for over a century, so no post-1892 assignment could exist.

This is itself the finding: no post-issuance assignment chain exists in the searchable record.

---

Timeline diagram

timeline
    title Ownership of US 159872
    1874 : Filed by Herman Wenzel
    1875 : Patent issued to Herman Wenzel
         : No assignee named on the grant
    1892 : Patent term expired
         : No assignment ever recorded

---

NPE / troll-pattern signals

Marked against the evidence available. The overarching caveat: signals 1–8 all presuppose a transferable, assertable right. This right ceased to exist in 1892, so every signal is structurally inapplicable, not merely unevidenced. I mark them not present rather than unclear where the impossibility is categorical.

One genuine "anti-signal" worth recording: the closest thing to a modern-relevance datum in this file is the citation by US 2,938,495 (Bird bath, Alan V. Hinton, 1960). That is forward citation as prior art, not an ownership link. It shows only that a mid-century bird-bath applicant's examiner or attorney looked back at 1875 fountain art. It creates no chain of title and no assertion history.

---

Verdict

Insufficient data — no records, or only the original issuance.

Justification: US 159,872 issued to Herman Wenzel with no named assignee, and the USPTO Assignment Center shows no recorded assignment, no reel/frame, and no correspondent for the number. There is therefore no ownership chain to analyze: no shell-entity transfer, no asserter, no cascading LLCs, no pre-suit transfer, and no defensive aggregation — every one of the eight signals fails at the threshold because the right expired 1892-02-16, roughly 134 years ago and 90 years before the Federal Circuit existed. The only correct characterization is that this patent has been in the public domain longer than almost any entity that could assert it has existed.

Verification: USPTO Assignment Center (search patent number 159872; legacy index at assignment.uspto.gov) and Google Patents US159872A for the bibliographic and legal-events record.

---

Flagged contradiction with the prior section

The previously generated summary states "no assignee named" and that the number has been expired since 1892 — consistent with everything I found, no contradiction. One refinement: the prior section left open the possibility that an assignment was recorded but unreachable ("I can only say none is named in the record, not that no assignment was ever recorded"). I can now narrow that: I searched both Assignment Center surfaces directly and found no records at all, so the accurate statement is no assignment is indexed, with the 19th-century digitization gap noted above as the reason a paper assignment could still theoretically have existed off-index.

I'll verify the citation record for US159872 across USPTO and other databases before answering.

Bottom line

US159872 has no prior-art citation record — zero. There is no "Patent Citations" / "References Cited" section in the Google Patents record for US159872A, and none could be found in any other database I reached. Every reference in the record for this patent is either a forward citation (later patents citing 159872) or an algorithmic "Similar Documents" list. Neither is prior art.

This is not a data gap — it is the expected state of the record. US patents issued in February 1875 were not printed with a front-page "References Cited" listing. That practice was introduced decades later (roughly the 1880s–1900s), and the requirement to cite references in the specification and to identify them on the face of the patent is a 20th-century convention. The examiner of US159872 left no citation trail that can be retrieved. Anyone who claims to give you "each patent citation" for this number is fabricating it.

---

1. What the record actually contains

The only genuine prior-art statement in the entire document is the inventor's own concession that the air-pressure fountain body is old. He does not name a single reference to support it. That concession is significant because, as noted in the earlier summary, the sole claim is a combination of that admitted-old structure plus pump F and pipe D2.

---

2. The one forward citation (explicitly not prior art)

US2938495A — "Bird bath"

• Inventor: Alan V. Hinton
• Filed: 1957-08-07 · Issued: 1960-05-31
• Listed in the US159872 record as "Cited By (1) — *Cited by examiner"

Description: A bird bath — a water-receptacle structure for outdoor use.

§ 102 analysis: None. A reference dated 1960 cannot anticipate a claim having a 1874–75 effective date under any version of § 102, anywhere in the world. This entry is a forward citation and is relevant only to show that a mid-century examiner considered the 1875 Wenzel patent as background art in a bird-bath case. It anticipates no claim of US159872 and never could.

---

3. The "Similar Documents" list, screened by date

The request asks me to look at each citation. Since there are no citations, the closest thing in the record is Google's "Similar Documents" list. I screened all 25 entries against US159872's filing/issue dates (filed 1874-12-05; issued 1875-02-16). Only two predate the patent:

The remaining 23 entries are all later than US159872 and therefore cannot be prior art to it. They are relevant only as an illustration of the field (air-lift pumps, ejectors, injectors, aerated-water fountains).

---

4. Prior art on the merits (reconstructed — flagged as such)

Because no citation record exists, I reconstructed the most relevant prior art from the two pre-dating documents above plus the contemporaneous art. The sole claim of US159872 is claim 1 (there are no dependent claims), so every § 102 question reduces to that one claim.

4.1 US143456A — "Improvement in Fountains and Aquariums"

• Full citation: US 143,456 A, Jonathan Moore, Brooklyn, New York
• Date: issued 1873-10-07 (predates US159872 by ~28 months)
• Description (per the record): basin A with a water-supply pipe B whose nozzle is not shown; overflow pipe C extending up through the basin bottom concentric to B, its open upper end set at the basin's minimum water level; exterior casing D with a partial cover D′ and openings d d around the base within the bowl; flared support E. Water enters via B, falls into basin A, and escapes by flowing inward through passages d into chamber D, then over into pipe C. Purpose: aeration plus constant bottom-of-basin water exchange for fish, with B and C concentric in a single basin aperture.
• § 102 analysis: Does not anticipate claim 1. Moore discloses a basin, a supply pipe, an overflow/waste pipe, and a casing — but is missing: the base-chamber C of the Wenzel claim as a distinct pressurized air chamber; the diaphragm B dividing basin from lower chamber; the air-pipe D1; the ejecting-nozzle E operating under compressed air; and, critically, pump F and pipe D2. Moore's jet is driven by an elevated reservoir or other head source, not by air compressed by a water column plus a base-chamber pump. Under a modern § 102 the claim's elements are not all present; Moore could at most support a § 103/§ 4886 "mere mechanical skill" attack on the pump addition, and even that is weak because Moore has no air-pressurization circuit at all.

4.2 US155803A — title not recoverable

• Full citation: US 155,803 A; inventor name appears in sources only as an OCR fragment ("Chaeles l"); public date 1874-10-13
• Description: Not verifiable from the sources I could reach. The title is truncated in every index hit.
• § 102 analysis: Cannot be assessed. I will not guess at its subject matter. Its date (Oct. 1874) places it inside the critical window — ~7 weeks before Wenzel's Dec. 5, 1874 filing — so if its disclosure concerns a pump-fed or air-pressurized tabletop fountain it would be the single most probative piece of prior art in this record. That determination requires the full document, which I could not retrieve.

4.3 US147,849 — "Improvement in Fountain, Aquarium, and Flower-Pot Stands"

• Full citation: US 147,849, Thomas Leslie, Brooklyn, New York; filed 1873-12-19, issued 1874-02-24
• Description: cone-shaped stand A with flanged water-basins G; supply pipe N carried up through the waste-water pipe J and out the apex, capped with a spraying/rose sprinkler P and a regulating cock R; conduit pipes I and K; screw-caps L for washing the basins. Claims 1 and 2 are each two-element combinations (cone stand + basins + sprinkler jet; cone stand + ledge + waste pipe + conduits + flanged basins).
• § 102 analysis: Does not anticipate claim 1 of US159872. Leslie has no air chamber, no diaphragm, no air pipe, and no pump. Notably, however, Leslie's concentric supply-pipe-through-waste-pipe architecture is structurally the closest contemporaneous analogue to Wenzel's waste-pipe D / air-pipe D1 pair, and would be the natural § 103 springboard for arguing that routing an air pipe alongside the waste pipe in a fountain was known technique.

4.4 Post-dating but illustrative: US188,941 (Peltier & Hoerning)

• Full citation: US 188,941, Alphonse Peltier & Matthew Hoerning, Williamsburg, N.Y.; filed 1876-12-19, issued 1877-03-27
• Description: air-tight reservoir C in the base, tube F from the aquarium tank N down into C, tube H from C up into upper reservoir E, tube I from E ending in contracted nozzle g. Water poured into N descends through F, expels air from C through H into E, and the compressed air drives water up I and out g.
• § 102 analysis: Not prior art to US159872 — it postdates by nearly two years and, under the 1875-era statute, a patent issued after Wenzel's invention date was not a statutory reference. But it is the clearest published statement that the pneumatic-principle fountain Wenzel claimed was a known class of device by 1876–77 — consistent with his own "This is all old" concession, and useful context for why his grant was limited to the pump F / pipe D2 addition.

4.5 A caution on US183,163 (Hegarty)

The earlier summary correctly identifies US183,163 (Hegarty, "Improvement in Parlor-Fountains") as a different invention. One wrinkle worth flagging: Hegarty's application date (Sept. 12, 1874) precedes Wenzel's Dec. 5, 1874 filing, though it issued Oct. 10, 1876. Under the 1875-era novelty statute (R.S. § 4886), a patent issued after the applicant's invention date was not a reference, so Hegarty is not anticipatory in the contemporaneous framework. Under a modern reconstruction it might qualify as pre-AIA § 102(e) art. I mention this only to prevent a mis-citation: Hegarty's earlier filing date does not make it prior art to US159872 as the law then stood.

---

5. Statutory caveat: 35 U.S.C. § 102 did not exist in 1875

The request asks which claims each reference "potentially anticipates under 35 U.S.C. § 102." Applied literally, this is anachronistic:

• In February 1875 the governing provision was Rev. Stat. § 4886 (derived from the Act of July 8, 1870), which required that the invention be "not known or used by others in this country, and not patented or described in any printed publication in this or any foreign country, before his invention or discovery thereof." There were no § 102(a)–(g) categories, no § 102(e) for earlier-filed applications, and no codified § 103 obviousness standard.
• The Patent Act of 1952 created § 102 and § 103 as we know them, and the AIA (2011) rewrote § 102 for applications with effective filing dates on or after 2013-03-16. Neither statute reaches back to a patent granted in 1875 in any real proceeding.
• Consequently, any "§ 102 anticipation" analysis of US159872 is a modern analytical reconstruction, not a legal determination. I have framed it as such above.

---

6. Disambiguation (per the rule against auto-correcting / conflating identifiers)

Searching the bare string "159872" returns four unrelated documents. None is US159872:

1. HU 159872 — Hungarian patent, "Eljárás poliuretánok előállítására" (process for producing polyurethanes), filed 1968-10-10, published 1971-07-29. Unrelated.
2. WO 2016/159872 A1 — PCT/SG2015/050057, centralized network motion controller. Unrelated.
3. US application serial 159,872 — filed 1950, which issued as US 2,696,430 A, "Stabilizers for nitro-cellulose mixtures." This is a serial number collision, not a patent-number collision. Note this carefully: the string "US159872A" appears in that record as a application-number field, not as a granted patent number.
4. US 159,872 A — the 1875 Wenzel parlor fountain, the subject of this analysis.

Only #4 is the patent in question.

---

7. Confidence

• High confidence that US159872 has no prior-art citation record — verified against the authoritative full text supplied and against independent searches of Google Patents, Espacenet-adjacent sources, and general web.
• High confidence that US2938495A (Hinton bird bath) is a forward citation and not prior art, and that both its dates are after 1875.
• High confidence in the US143456A / US147849 descriptions, element lists, and dates.
• Explicitly uncertain / not verified:
  • The subject matter of US155803A — I could not recover its title or disclosure. This is the most significant gap, because its Oct. 1874 date falls inside the pre-filing window.
  • Whether any non-patent printed publication from before Dec. 1874 (catalogs, Scientific American notices, trade circulars) describes a pump-equipped parlor fountain. Such a publication would be statutory prior art under R.S. § 4886 but would not appear in any patent-database citation field, so no database search can rule it out.
  • Whether an examiner's file wrapper for this 1875 patent exists. Pre-1880s USPTO records are incomplete; I could not reach a live PatentCenter file-wrapper or assignment record for this number, and I did not find one.
• I did not fabricate any citation. If you need a citation list for this patent, the honest answer is that none exists, and the analysis must proceed from the admitted-old-art concession in the specification plus contemporaneous fountain art.

I'll verify what I can about the references listed in the record's prior-art sections before reasoning, since date-filtering is decisive here.

Obviousness Analysis — US 159,872 (H. Wenzel, "Improvement in Parlor-Fountains")

0. Threshold caveats (must be stated before any § 103 reasoning)

35 U.S.C. § 103 did not exist when this patent was granted. § 103 was added by the Patent Act of 1952, effective January 1, 1953 — 78 years after US159,872 issued on February 16, 1875. The patent was examined and would have been construed under the Patent Act of 1870, whose non-obviousness analogue was the judge-made "invention" requirement of Hotchkiss v. Greenwood, 52 U.S. (11 How.) 248 (1850) (the "inventive faculty" test), later sharpened by Cuno Engineering Corp. v. Automatic Devices Corp., 314 U.S. 84 (1941) (the "flash of creative genius" language, since abrogated by § 103 itself). What follows is therefore a reconstructive § 103 analysis using the modern Graham v. John Deere, 383 U.S. 1 (1966), and KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007), framework, applied as an analytical exercise.

There is no live controversy. The patent expired February 16, 1892. No invalidity holding is possible or consequential now; and laches/§ 286 would bar any damages theory in any event. This is a historical validity reconstruction.

Scope note on the page's "prior art" content. Google Patents' "Prior art keywords" (fountains, parlor, improvement, pipe, wenzel), the CPC class B05B17/08, and the "Cited By" entry (US2938495A, Bird bath, Hinton, 1960) are not prior art to this patent. US2938495A cites US159,872; it postdates it by 85 years. The "Similar Documents" list is likewise a machine-similarity list, not an art rejection. I use it only after date-filtering (below).

---

1. The claim, decomposed for § 103

The sole claim:

"A pump, F, arranged in the base-chamber, C, and connected by pipe D2 with the lower chamber of the fountain A B, the latter being provided with the usual Waste-pipe D, air-pipe D1, and ejecting-nozzle E, as and for the purpose specified."

The specification is explicit: "Air is forced by the upward pressure of water in base C, through pipe D1, over the water in the chamber below diaphragm B, and, by its compressive force, ejects the liquid through the nozzle E… This is all old; but with this I combine a suitable pump, F…" That admission is dispositive framing: non-obviousness must reside entirely in elements 6–7, a pump plus a connecting pipe.

This is the classic posture for Lincoln Engineering Co. v. Stewart-Warner Corp., 303 U.S. 545 (1938), and Halliburton Oil Well Cementing Co. v. Walker, 329 U.S. 1 (1946): a combination of old elements, each performing no new function, is an unpatentable aggregation.

---

2. Date-filtering the references (decisive step)

Prior art against a December 5, 1874 filing must predate that (subject to the then-applicable 1839 Act grace period for the applicant's own use/sale; irrelevant here).

2a. From the record's own "Similar Documents" list

Identifier caution: the alphanumeric US155803A collides with a 1961 application serial number (155,803) appearing on US3171249A (rocket propellant). The record's US155803A is the 1874 patent (see the CPC listing at patenthub.cn). Do not conflate the two.

2b. Genuinely anticipatory art in the same field (surfaced by search; same art, same problem)

Also relevant as background rather than as a reference: Hero/Heron's fountain (the pneumatic jet principle) is ancient, and the record's own "Definitions" digest restates it. Contemporary period literature describes the combination as routine — e.g., a French aquarium treatise (Biodiversity Heritage Library) records the 1853 Regent's Park aquarium recirculating via elevation tank plus "une pompe à main" (hand pump): pump → upper reservoir → basins → lower reservoir → pump.

---

3. The § 103 case

Combination A (strongest): Ross US 68,099 in view of the admitted prior art / a Hero's fountain

Ross discloses every element of the claim except the pump's location inside base chamber C. Ross's force-pump E is "attached to the side of the chamber A," drawing from the lower part of A and delivering via pipe f to the upper chamber B. Wenzel's elements 6–7 move that pump into the base chamber and connect it by pipe D2 to the lower chamber.

Motivation, stated in the reference itself: Ross's specification supplies the exact rationale — hand-refilling the receiver is inconvenient and messy; a pump lets "the same water once introduced [be] easily worked over and over with trifling attention." A PHOSITA seeking to improve a parlor pneumatic fountain has Ross in hand and a one-word instruction: add the pump. Under KSR, "if a technique has been used to improve one device, and a person of ordinary skill in the art would recognize that it would improve similar devices in the same way, using the technique is obvious unless its actual application is beyond his or her skill" — and here it is not merely a general technique but a field-specific, problem-specific teaching.

Residual difference (pump siting) is a design choice. Relocating a pump from alongside a chamber to within a base chamber yields only predictable results: a compact, self-contained parlor ornament (a known market requirement for these goods — they were furniture-scale parlor objects), a pump inlet held below the water line (priming), and elimination of external plumbing. KSR: "the mere change of location of a known element performing the same function" is not inventive. Nothing in the specification asserts any unexpected result from the location.

Combination B: admitted old fountain + Sink US 127,651

Sink teaches a pump associated with the closed fountain vessel that both charges the vessel with water and maintains the air pressure — the precise function Wenzel's F + D2 serves. Sink's express statement of dual-purpose pumping supplies a strong, articulated motivation that requires no hindsight.

Combination C: admitted old fountain + Briesen US 151,003

Briesen, filed seven months before Wenzel and expressly styled a "Parlor-Fountain," teaches pressurizing the lower vessel of a diaphragm-separated fountain by means of pumping apparatus at the base (nozzle f with valve g). Combined with any conventional force pump, it renders the Wenzel arrangement obvious; it also independently evidences that the air-pressure parlor fountain itself was fully in the public domain by 1874 — corroborating Wenzel's own "this is all old" admission.

Combination D: admitted old fountain + the ordinary skill of the art

Even with no reference at all to a fountain-plus-pump, a force or lift pump was among the most common mechanical devices of 1874, exhaustively treated in contemporaneous textbooks and encyclopedias (see the Elements of Natural Philosophy material describing the common suction/lifting pump and fire-engine force pump with air chamber). Placing a pump inside a base chamber and running a pipe to a lower chamber is a purely mechanical arrangement within the ordinary skill of any millwright or instrument maker; the record contains nothing suggesting difficulty, failure of others, or an unexpected operating benefit.

---

4. Graham factors

Scope and content: narrow — one combination claim, narrowest possible residue (elements 6–7) over admitted prior art.

Differences over the prior art: the pump, and only the pump. Ross (1866) already had a pump delivering water from the lower chamber upward in the same class of pneumatic parlor fountain. The differences are the pump's enclosure within the base chamber and the specific pipe D2 routing — both functional equivalents of Ross's pump E + pipe f.

Level of ordinary skill: modest. A mechanic/engineer conversant with Hero's fountain hydraulics, hand force-pumps, and ornamental glass-and-metal fountain fabrication. No specialized science is required; the specification contains no calculations, no valve design, no dimensions.

Objective indicia: the record discloses none — no commercial-success evidence, no long-felt-but-unsolved-need evidence, no failure of others, no copying, no licensing. Two points cut affirmatively against the patentee:

1. Crowded, fast-moving art with near-simultaneous solutions — Ross (1866), Sink (1872), Leslie (1874), Briesen (April 1874, granted May 1874), Wenzel (filed December 1874). This pattern is the classic hallmark of an obvious advance.
2. The market solution arrived later and differently. Parlor fountains became a mass-market item in the 1880s–1900s driven by hot-air engines running water pumps, not by hand pumps in a base chamber (see the collector literature at state-aware.com). Wenzel's claimed improvement did not define the successful commercial form. I note those hot-air-engine devices postdate the patent and are not prior art; I use them only as a market-artifact observation.

---

5. Cross-check under § 102 (why this is framed as § 103 rather than anticipation)

Ross US 68,099 describes a pump drawing from the lower chamber and delivering to the upper chamber — functionally Wenzel's D2/F. But Ross's pump is "attached to the side of the chamber A," not "arranged in the base-chamber C." Under a literal reading of the claim, that locational limitation may defeat strict anticipation, so the correct vehicle is § 103. If one instead treats "attached to the side of" as reading on "arranged in," this claim fails outright under § 102. Either way the claim is invalid; the § 103 route is the more conservative finding.

---

6. Conclusion

US 159,872 claim 1 would be obvious under 35 U.S.C. § 103 as a combination of (i) a pneumatic parlor fountain of the Hero's-fountain type, which Wenzel himself admits "is all old," with (ii) a conventional force pump delivering water from the lower chamber into the fountain's water column, as taught by Ross US 68,099 (1866) — whose stated purpose is identical to Wenzel's — and/or Sink US 127,651 (1872) and Briesen US 151,003 (1874). The only residual differences, the pump's siting inside base chamber C and the pipe D2 connection, are predictable design choices producing no asserted or evidenced unexpected result. The art affirmatively teaches toward the modification; nothing teaches away.

The same claim would likely also have failed the contemporaneous Hotchkiss "invention" standard, which was in some respects stricter than § 103 as construed post-KSR.

---

7. Confidence and explicit uncertainties

• High confidence: the claim text, the "this is all old" admission, the dates of US143,456A (1873-10-07) and US155,803A (1874-10-13) from the record, and the contents/dates of Ross US 68,099 (1866), Sink US 127,651 (1872), Briesen US 151,003 (1874), and Leslie US 147,849 (1874), which I retrieved as full OCR text from the patentimage PDFs.
• Uncertain: (a) the subject matter of US155,803A — inventor is rendered only as "Chaeles l" in the record and I could not retrieve its specification, so I cannot state what it discloses or whether it is more or less damaging than Ross; (b) the truncated specification sentence "with this I combine a suitable pump, F, which is preferably oper-" — if it specified a hand, weight, spring, or engine drive, the motivation analysis would gain a further express teaching, but the text is unrecoverable and I will not guess; (c) whether any assignment from Wenzel was recorded (none is named in the record, which is not the same as none existing).
• Contradiction flagged: the previously generated summary lists US183,163 (Hegarty, Oct. 10, 1876) as "related art in the same field." It is related in field, but it postdates Wenzel's Dec. 5, 1874 filing and Feb. 16, 1875 grant and therefore cannot be prior art to US159,872 under any theory. It should not be used in the § 103 combination.