Litigation

Untitled case

decided; affirmed in part, reversed in part, remanded

19-2359; 20-1217

Terminated
2020-12-07

Patents at issue (1)

8080467

Summary

Federal Circuit appeal from the District of Massachusetts judgment in the '467 patent case. The court affirmed the infringement/ownership rulings as to disputed U.S. patents, declined to reach willfulness, reversed the denial of sole ownership of disputed foreign patents and remanded to compel their transfer to SiOnyx, and affirmed denial of § 285 fees.

Case overview & background

Plain-language overview of the case: parties, accused product, patents at issue, and why the suit matters.

I'll research the underlying facts before drafting the overview.

Now let me verify patent specifics, the IPR outcomes, and corporate/market context.

Case overview and background

The parties. SiOnyx, LLC v. Hamamatsu Photonics K.K., Nos. 2019‑2359 & 2020‑1217 (Fed. Cir.), is the appeal from SiOnyx, LLC v. Hamamatsu Photonics K.K., No. 1:15‑cv‑13488‑FDS (D. Mass.), a hybrid patent/contract/ownership case between a venture-backed practicing company and a much larger Japanese photonics manufacturer. SiOnyx (Beverly, Mass.; founded 2006) is not an NPE — it makes ultra-low-light CMOS image sensors and digital night-vision cameras (XQE sensor family, Aurora/Opsin cameras) and is a defense supplier; it raised roughly $20–32 million from investors including Polaris, Vulcan Capital, Harris & Harris, Crosslink and In‑Q‑Tel, and was acquired by DC Capital Partners on Aug. 11, 2021, after the appeal (PitchBook; William Blair transaction note; Mintz press release). Its technology traces to Harvard: Prof. Eric Mazur and his student James E. Carey discovered that femtosecond-laser irradiation of silicon in a sulfur-bearing gas produces a highly absorptive, near-infrared-sensitive "black silicon" surface; they filed a provisional in May 2001, and the resulting patent family included the '467 patent, which The President and Fellows of Harvard College owns and exclusively licensed to SiOnyx (license dated Feb. 10, 2006). Harvard was therefore a co-plaintiff, principally to supply standing on the '467 patent. The defendants are Hamamatsu Photonics K.K. (HPK), the Hamamatsu, Japan integrated-photonics group and one of the world's dominant photodetector/optoelectronic device makers (the complaint cited ~¥112 billion in net sales), its New Jersey-based North American sales subsidiary Hamamatsu Corporation (HC), and, initially, Ocean Optics, Inc., a Florida spectrometer maker that bought accused sensors through HC (complaint, reproduced at RPX; D. Mass. claim-construction opinion, Dkt. 566).

The accused technology and the patents. The accused products are Hamamatsu's laser-textured "black silicon" silicon photodetectors — back-illuminated photodiodes, avalanche photodiodes and FFT-CCD/CCD image sensors sold beginning around 2010, including the S11499 and S11510 series, which Hamamatsu marketed as using a laser-formed "MEMS structure" on the back side for "drastically improved sensitivity in the near infrared" (complaint analysis). The downstream theory ran through Ocean Optics' Maya2000 Pro‑NIR spectrometer, which incorporated the accused S11510. The asserted patents were:

Patent Owner One-line technical sketch Role in the case
U.S. 8,080,467 ("Silicon-Based Visible and Near-Infrared Optoelectric Devices"; issued Dec. 20, 2011; inventors Carey & Mazur) Harvard (SiOnyx exclusive licensee) Method claim: fabricate a radiation-absorbing wafer by irradiating silicon with temporally short (femtosecond) laser pulses while exposing it to an electron-donating species (e.g., SF₆), creating a disordered, sulfur-hyperdoped surface layer, then annealing to raise carrier density and form a p‑n junction with strong sub-band-gap/NIR responsivity (IPR2017‑00909 preliminary record) The only patent that reached the jury on infringement; found infringed and willfully infringed, with $0 damages
U.S. 8,680,591 ("Photosensitive Imaging Devices and Associated Methods") SiOnyx Device claims to textured-region photosensitive imagers Asserted, then narrowed; heavily invalidated in IPR (claim 26 survived) and effectively not part of the verdict
U.S. 7,884,446 (Harvard; Mazur/Shen) Harvard Sub-micron "undulating topography" semiconductor substrate Asserted in the complaint, then stipulated out after its claims were cancelled in IPR
Nine Hamamatsu U.S. patents (8,564,087; 8,629,485; 8,742,528; 8,884,226; 8,916,945; 8,994,135; 9,190,551; 9,293,499; 9,614,109) plus Japanese/foreign counterparts Hamamatsu (as issued) Hamamatsu's own black-silicon photodetector patents, filed in Japan from Feb. 24, 2009 Subject of SiOnyx's 35 U.S.C. § 256 correction-of-inventorship and NDA-based ownership claims, which the jury and district court resolved in SiOnyx's favor (final judgment, Dkt. 834)

Procedural posture, venue, and why the case matters. SiOnyx sued in the District of Massachusetts in 2015, assigning the case to Judge F. Dennis Saylor IV. Venue was natural and uncontested: the exclusive licensee and the patent-owning university are both in Massachusetts (Beverly and Cambridge), and suit predated TC Heartland, so Hamamatsu's Japanese principal place of business was no obstacle; the court also exercised specific jurisdiction over HPK based on the parties' 2007 joint-development collaboration and HPK's sales into the U.S. through HC. After claim construction (Dkt. 566), an IPR-era claim-narrowing fight (the court struck SiOnyx's attempt to reinsert '591 claim 26, Dkt. 459), and a jury trial in May 2019, the jury found an NDA breach (damages $796,469 plus $1,091,481 prejudgment interest), unjust enrichment ($580,640 plus $660,536 interest), willful infringement of the '467 patent with zero infringement damages, and that Dr. Carey was a co-inventor

Key legal developments & outcome

Major rulings, motions, claim construction, settlements, and the present posture or final disposition.

I'll research this case thoroughly. Let me start with the Federal Circuit opinions and district court docket.

Good foundation. Now let me dig into the district court docket details, the second appeal (20-1217), and the PTAB proceedings.

Let me get the district court docket and the key opinions (claim construction, summary judgment, IPR estoppel).

Plaintiff representatives

Counsel of record for the plaintiff(s): attorneys, firms, and roles (lead counsel, of counsel, local counsel).

I'll research the docket and counsel appearances for this case.

Let me get the Federal Circuit opinion's counsel block and docket details.

Let me verify the exact counsel block in the opinion and the district court appearances.

Bottom line

The plaintiffs/cross-appellants were SiOnyx, LLC and The President and Fellows of Harvard College. Both were represented throughout the district court case and the Federal Circuit appeals by the same Boston firm — Pepper Hamilton LLP (renamed Troutman Pepper Hamilton Sanders LLP after the 2020/21 Pepper–Troutman Sanders combination). The Federal Circuit's counsel block for the Dec. 7, 2020 opinion (981 F.3d 1339) reads: "WILLIAM D. BELANGER, Troutman Pepper Hamilton Sanders LLP, Boston, MA, argued for plaintiffs-cross-appellants. Also represented by ANTHONY H. CATALDO, GWENDOLYN TAWRESEY." (opinion text via cetient/court reproduction; Justia/FindLaw text)

Underlying district case: SiOnyx, LLC v. Hamamatsu Photonics K.K., No. 1:15-cv-13488-FDS (D. Mass., Judge F. Dennis Saylor IV); appeals Nos. 2019-2359 & 2020-1217.

Counsel of record for Plaintiffs SiOnyx, LLC and Harvard

Attorney Role Firm / office Note
William D. Belanger Lead counsel — lead trial counsel and the attorney who argued the Federal Circuit appeal Pepper Hamilton LLP → Troutman Pepper Hamilton Sanders LLP, 125 High Street, 19th Floor, High Street Tower, Boston, MA 02110 Registered patent attorney and the constant Federal Circuit advocate for SiOnyx; also argued SiOnyx's earlier PTAB appeal, No. 2018-2019 (Fed. Cir. Apr. 3, 2019) — "WILLIAM D. BELANGER, Pepper Hamilton LLP, Boston, MA, argued for appellant. Also represented by GWENDOLYN TAWRESEY" (Justia PDF).
Anthony H. Cataldo Of counsel / core trial-and-appeal team (named in the Federal Circuit counsel block and in district-court signature blocks) Pepper Hamilton / Troutman Pepper, Boston Listed in the Fed. Cir. merits counsel block for the cross-appeal and on district-court filings for both plaintiffs.
Gwendolyn Tawresey Of counsel / core trial-and-appeal team (Fed. Cir. counsel block; district-court signature block) Pepper Hamilton / Troutman Pepper, Boston Argued Federal Circuit appeals for the same client group and firm, e.g., Andrea Electronics Corp. v. Apple Inc., No. 2023-1454 (Fed. Cir. Aug. 8, 2024) — "GWENDOLYN TAWRESEY, Troutman Pepper Hamilton Sanders LLP, Boston, MA, argued for appellant." (Fed. Cir. Rule 36 judgment).
Miranda Hooker Of counsel — district-court team Pepper Hamilton, Boston Appears in the district-court signature block as "Counsel for Plaintiffs SiOnyx, LLC and President and Fellows of Harvard College" along with Cataldo and Tawresey (reproduced in RPX Insight document 13559656).
Thomas J. Engellenner (Reg. No. 28,711) Lead PTAB counsel for SiOnyx as patent owner (not shown as counsel of record on the D. Mass./Fed. Cir. dockets) Pepper Hamilton LLP, 125 High Street, 19th Floor, Boston, MA 02110 Designated lead counsel in Hamamatsu Corp. v. SiOnyx, LLC, IPR2017-00909 (the IPR on the '467 patent), per SiOnyx's mandatory notice (PTAB filing).
Reza Mollaaghababa (Reg. No. 47,977) Back-up PTAB counsel Pepper Hamilton, Boston Named as back-up counsel with Engellenner in IPR2017-00909 (same mandatory notice).

Post-appeal (2021 rehearing stage) the same team signed for the plaintiffs: "/s/ William Belanger — WILLIAM BELANGER, GWENDOLYN TAWRESEY, ANTHONY CATALDO, PEPPER HAMILTON LLP, 125 High Street, 19th Floor, Boston, MA 02110 … Counsel for Plaintiffs-Cross Appellants SiOnyx LLC and President and Fellows of Harvard College" (SiOnyx response to rehearing petition).

Points of qualification

  • No separate Harvard counsel of record identified. Every signature block I found for this case lists Pepper Hamilton as counsel for both SiOnyx and Harvard; I found no separate Harvard Office of the General Counsel or outside Harvard counsel appearance. It is possible Harvard had non-appearing in-house oversight, but that is not documented in the materials I could review.
  • No in-house attorney of record. SiOnyx's CEO Steve Saylor appears only as a trial witness, not as counsel.
  • No separate "local counsel." D. Mass. does not require local counsel, and Pepper Hamilton's Boston office served that function.
  • Firm name change: contemporaneous 2015–2020 filings say "Pepper Hamilton LLP"; the Federal Circuit's late-stage correspondence and the reported opinion use "Troutman Pepper Hamilton Sanders LLP" (the firms combined in the 2020–21 period). One docket-aggregator entry (19-2359 case page) lists "Troutman Sanders LLP" next to Belanger — that appears to be an aggregator labeling artifact rather than a separate firm appearance.
  • Sourcing caveat: I was not able to pull the PACER docket sheet directly; the appearances above are reconstructed from the Federal Circuit opinion's counsel block, reproduced D. Mass. filings (RPX Insight, GovInfo), PTAB papers, and Federal Circuit rehearing filings. Individual attorney-to-document attribution beyond those signature blocks (e.g., exact appearance dates and ECF entry numbers) should be confirmed against the D. Mass. docket for No. 1:15-cv-13488.
  • For completeness, opposing counsel (defendants Hamamatsu Photonics K.K. / Hamamatsu Corp.) were led on appeal by John D. Simmons of Panitch Schwarze Belisario & Nadel LLP — not a plaintiff-side attorney.

Defendant representatives

Counsel of record for the defendant(s): attorneys, firms, and roles (lead counsel, of counsel, local counsel).

I'll research the docket and counsel for the defendant(s) in this appeal.

Key lead found: the rehearing petition was signed by John D. Simmons as "Counsel for Defendants-Appellants." Let me confirm the full counsel block from the opinion and docket.

Good. Now let me pin down all Hamamatsu counsel appearances on the Federal Circuit docket and the district court roster.

Bottom line

The defendants below — Hamamatsu Photonics K.K. (HPK) and its U.S. sales subsidiary Hamamatsu Corporation (HC) — were represented in the Federal Circuit by a small Panitch Schwarze Belisario & Nadel LLP team out of Philadelphia, led by John D. Simmons, with Keith A. Jones appearing as of counsel. There was no separate Boston/local appellate counsel on the Federal Circuit docket, and no in-house attorney entered an appearance on the court's docket. (Both appeals, Nos. 19-2359 and 20-1217, arose from SiOnyx, LLC v. Hamamatsu Photonics K.K., No. 1:15-cv-13488-FDS (D. Mass.); the panel decision is reported at 981 F.3d 1339 (Fed. Cir. Dec. 7, 2020) (Lourie, J.).)

Counsel of record for Defendants‑Appellants (Hamamatsu Photonics K.K. and Hamamatsu Corporation)

Attorney Role Firm / office Experience note
John D. Simmons Principal (lead) counsel for Appellants — Fed. Cir. ECF No. 9 (entry of appearance, Dec. 12, 2019); signed the combined petition for panel rehearing/en banc, ECF No. 61 (Jan. 6, 2021) as "Counsel for Defendants‑Appellants" Panitch Schwarze Belisario & Nadel LLP, Two Commerce Square, 2001 Market Street, Suite 2800, Philadelphia, PA (jsimmons@panitchlaw.com; 215‑965‑1268) Registered patent attorney; also lead counsel for Hamamatsu in the district court and petitioner's counsel in the parallel PTAB proceeding on the '467 patent (IPR2017‑00909). Firm bio lists other Hamamatsu patent suits, e.g., Hamamatsu Corp. v. Energetiq Tech. and Hamamatsu Corp. v. Unibeam Photonics. Quoted by Law360 (Mar. 29, 2018) on the summary-judgment/statute-of-limitations argument in this case.
Keith A. Jones Of counsel for Appellants — Fed. Cir. ECF No. 25 (corrected entry of appearance, Jan. 2, 2020; original ECF No. 12, Dec. 12, 2019, was docketed as non-compliant) Panitch Schwarze Belisario & Nadel LLP (listed on the Federal Circuit docket as co-counsel with Simmons; same Philadelphia office) Co-counsel with Simmons on the Hamamatsu defense throughout the appeal and the PTAB work on the '467 patent. (Firm affiliation is drawn from the docket grouping and firm listings; I did not independently retrieve his individual firm bio page.)

Sources: Federal Circuit docket entries reproduced at Patexia's litigation page for SiOnyx LLC v. Hamamatsu Photonics K.K. (https://services.patexia.com/lawsuits/SiOnyx-LLC-v-Hamamatsu-Photonics-KK-id-[145161](/patent/145161)/documents) — ECF 9, 12, 25, 33; the rehearing petition, Case 19‑2359, Doc. 61 at 1 (signature block and "Counsel for Defendants‑Appellants"), http://fedcircuitblog.com/wp-content/uploads/2020/12/SiOnyx_Petition.pdf; clerk's Jan. 7, 2021 invitation for response addressed to cross-appellants' counsel William D. Belanger at Troutman Pepper, https://fedcircuitblog.com/wp-content/uploads/2020/12/SiOnyx_InvitationForResponse.pdf; Panitch Schwarze firm page for John D. Simmons, https://www.panitchlaw.com/team/john-d-simmons/; Panitch firm news item quoting Simmons on this case, https://www.panitchlaw.com/simmons-quoted-in-law360/.

Notes, gaps, and things I could not verify

  • Local counsel at the Federal Circuit stage: none appears in the entries of appearance I could retrieve. Panitch Schwarze (Philadelphia) acted as lead appellate counsel directly; I found no Boston/New England firm entering an appearance for Hamamatsu on the Federal Circuit docket.
  • In-house counsel: no Hamamatsu in-house attorney is identified on the Federal Circuit docket. I found no sourced name for Hamamatsu's Japanese IP/legal department personnel, so I am not naming anyone.
  • Possible additional counsel: a third-party docket aggregator (ai-lab.exparte.com, https://ai-lab.exparte.com/case/cafc/19-2359/president-fellows-of-harvard-college-v-hamamatsu-photonics-kk) shows, in garbled form, additional name strings alongside Simmons and Jones — including a partial "Stephen E. ___" and "Minamino Law Office PLLC / Koichiro Minamino." I could not confirm either from PACER, the opinion's counsel block, or a firm source, so treat them as unverified rather than confirmed of-record counsel. (Minamino Law Office is a Tokyo-based IP firm, which would be consistent with Japanese-law/coordination counsel for a Japanese client, but I have no filing confirming an appearance.)
  • District court roster: Simmons and Jones also appear as Hamamatsu's counsel in the underlying D. Mass. case (No. 1:15-cv-13488-FDS), including the PTAB petition signature block listing Panitch's Philadelphia address for "Petitioners" in IPR2017-00909 on U.S. Patent 8,080,467. I did not retrieve a clean D. Mass. appearance list, so I cannot rule out additional trial-level counsel who did not appear on the appeal.
  • Nothing appears to be sealed as to counsel: entries of appearance, the docketing statement (ECF 13), the emergency stay motion (ECF 29), and the reply brief (ECF 33) are all public and identify Simmons as the filing attorney.
  • The counsel for the opposing side, for context only: William D. Belanger (principal counsel) and Gwendolyn Tawresey, Troutman Pepper Hamilton Sanders LLP (formerly Pepper Hamilton), Boston — ECF Nos. 27–28.

If you need the exact caption-block counsel listing from the published opinion itself (981 F.3d 1339), that is the one remaining item worth pulling directly from the PDF; the opinion's counsel block would be the authoritative cross-check on whether any name beyond Simmons and Jones appeared for Hamamatsu.