Litigation

SiOnyx LLC v. Hamamatsu Photonics K.K.

affirmed in part; reversed in part; remanded

19-2359

Terminated
2020-12-07

Patents at issue (2)

8680591
8080467

Plaintiffs (1)

Summary

SiOnyx appealed the D. Mass. judgment in its case against Hamamatsu. The Federal Circuit affirmed the ownership award, injunctions, damages, and interest awards, but reversed the refusal to compel transfer of foreign patents and remanded.

Case overview & background

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

Case overview and background

Correction to the framing first: although it is a patent case, SiOnyx LLC v. Hamamatsu Photonics K.K., Nos. 2019‑2359, 2020‑1217 (Fed. Cir. Dec. 7, 2020), 981 F.3d 1339, was not primarily an infringement action. It was a contract/inventorship/ownership case with one infringement count attached. The district court case was SiOnyx, LLC v. Hamamatsu Photonics K.K., No. 1:15‑cv‑13488‑FDS (D. Mass.), before Judge F. Dennis Saylor IV in Boston; plaintiffs were SiOnyx LLC and the President and Fellows of Harvard College, defendants were Hamamatsu Photonics K.K. (HPK), its U.S. sales subsidiary Hamamatsu Corporation (HC), Ocean Optics, Inc. (a spectrometer maker that bought accused sensors) and Does 1–10. SiOnyx is an operating company, not an NPE: a venture‑funded Harvard spin‑out founded in the mid‑2000s by Prof. Eric Mazur and his former student James Carey to commercialize "black silicon" — silicon surface‑textured with ultrashort laser pulses so that it absorbs near‑infrared light well beyond silicon's normal bandgap — for CMOS image sensors, night vision and machine vision, with DARPA and other government funding. Hamamatsu is a large Japanese photonics manufacturer (photodetectors, PMTs, CCD/CMOS sensors, light sources) and a direct competitor in the relevant sensor market. Harvard owned the Mazur/Carey patent and exclusively licensed it to SiOnyx (Feb. 10, 2006).

The technology and the two asserted patents. The accused products were Hamamatsu's laser‑textured, near‑IR‑enhanced silicon sensors — including the S11499 and S11510 series back‑illuminated FFT‑CCD image sensors and related photodiodes/avalanche photodiodes released beginning in 2010 — plus downstream products such as the Ocean Optics Maya2000 Pro‑NIR spectrometer. Two patents were pleaded: U.S. Patent No. 8,680,591 ("Photosensitive Imaging Devices and Associated Methods"), owned outright by SiOnyx and naming six SiOnyx employees (Haddad, Jiang, McKee, Miller, Forbes, Palsule) as inventors — it claims photosensitive devices having a textured region coupled to a semiconductor substrate with doped regions forming a junction, i.e., the device‑level black‑silicon imager; and U.S. Patent No. 8,080,467, owned by Harvard and exclusively licensed to SiOnyx, naming Mazur and Carey, which claims a method of fabricating a semiconductor wafer by irradiating surface locations of a silicon substrate with temporally short laser pulses. The '591 was asserted in the complaint and litigated through summary judgment (see SiOnyx, LLC v. Hamamatsu Photonics K.K., 332 F. Supp. 3d 446 (D. Mass. 2018)); by the time of trial the infringement case presented to the jury was limited to the '467, and only the '467 appears in the verdict and final judgment. Separately, SiOnyx sought correction of inventorship under 35 U.S.C. § 256 as to nine Hamamatsu‑owned U.S. patents (the '109, '499, '551, '135, '945, '226, '528, '485 and '087 patents) that descended from HPK's Feb. 24, 2009 Japanese priority application — the "Disputed U.S. Patents."

Procedural posture, venue, and why it matters. The suit was filed in the fall of 2015, before TC Heartland, so there was no patent‑venue fight; D. Mass. was the natural forum because Harvard and SiOnyx were Massachusetts institutions, the 2007 NDA and the confidential disclosures were centered there, and Hamamatsu's U.S. subsidiary did business nationally. After a two‑to‑three‑week jury trial, the jury returned a plaintiffs' verdict on May 9, 2019: breach of the NDA (first breach Feb. 1, 2008), unjust enrichment, Dr. Carey as co‑inventor of the Disputed U.S. Patents, and willful infringement of the '467 — but $0 in patent damages ($796,469 contract damages; $580,640 unjust enrichment). Post‑trial, Judge Saylor denied Hamamatsu's JMOL motions (ECF 797; 2019 WL 3358691), denied SiOnyx's § 285 fee motion (ECF 798), awarded SiOnyx sole ownership of all nine Disputed U.S. Patents on the theory that NDA § 5 gave the disclosing party all rights "in, or arising from" its confidential information, and entered permanent injunctions both for infringement of the '467 and, as a contract remedy, against practicing the Disputed Patents (2019 WL 3358599; final judgment ECF 834, Sept. 24, 2019, roughly $3.13M total with prejudgment interest). The Federal Circuit (Lourie, joined by Reyna and Wallach) affirmed everything except the refusal to award the foreign counterparts, holding that a court with personal jurisdiction may order a party to assign foreign patents as an equitable remedy and that the Japanese applications, as priority parents of the U.S. patents, necessarily covered the same inventions; it declined to reach willfulness. Hamamatsu's combined panel rehearing/en banc petition (arguing the contract injunction violated Rule 65(d) specificity) was denied on Feb. 24, 2021, with mandate March 3, 2021.

Why the case is cited. Three reasons. (1) It is now the go‑to authority that U.S. courts can compel assignment of foreign patents as an in personam remedy (citing Richardson, 868 F.2d 1249), with the caveat that the judgment does not adjudicate foreign validity — a significant holding for cross‑border technology disputes, and the practical result was transfer of an entire international portfolio for a ~$3M judgment. (2) It cleanly separates inventorship from ownership: "while conception is the touchstone of inventorship, ownership operates based on contract," so a co‑inventor defendant can still lose 100% of the patent under an NDA's IP‑assignment clause — a drafting cautionary tale widely covered by firms (Finnegan, McDermott, Alston & Bird, Schwabe). (3) It is a notable eBay data point: a permanent injunction issued for the '467 even though the jury awarded zero infringement damages, because the breach‑accelerated market entry made harm hard to quantify — and the affirmance of post‑NDA‑expiry damages and a broad "products practicing the patents" injunction survived a Rule 65(d) rehearing challenge. Contextually, it pitted a small U.S. black‑silicon/SWIR imaging start‑up against a Japanese sensor incumbent in markets (night vision, machine vision, automotive/defense sensing, medical imaging) where near‑IR sensitivity is the competitive battleground, and it shows NDA/trade‑secret‑style claims functioning as a portfolio‑transfer weapon where a bare infringement case (zero damages) would have delivered little.

Sourcing caveats. The party, court, docket, verdict, judgment and appellate holdings above are grounded in the Federal Circuit opinion (981 F.3d 1339; FindLaw/CourtListener/Casetext copies), the D. Mass. post‑trial orders (ECF 797, 798, 801, 831, 834) and the Feb. 24, 2021 rehearing denial. Two points I could not fully verify from the sources retrieved: Hamamatsu did file a PTAB petition, IPR2017‑00909, against the '467 patent on Feb. 15, 2017 (petition text is available via Docket Alarm), but I could not confirm from the retrieved material whether the Board instituted review or the final written outcome — so treat the "IPR linkage" as an unverified parallel challenge rather than a confirmed result. Likewise, the precise mechanism by which the '591 dropped out of the trial (dismissal vs. summary judgment in the 2018 opinion at 332 F. Supp. 3d

Key legal developments & outcome

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

I'll research this case systematically, starting with the Federal Circuit opinion and working backward through the district court record.

Now let me dig into the district court chronology and any PTAB proceedings on the asserted patents.

Let me get the docket-level detail: complaint, answer/counterclaims, and the IPR history on both patents.

SiOnyx LLC v. Hamamatsu Photonics K.K. — Litigation Timeline

Bottom line: This was not primarily a patent case. It was an NDA/confidential-information case in which patent law supplied the remedies. SiOnyx lost its patent (the '591) at the PTAB, won a willfulness verdict on the '467 while being awarded $0 in patent damages, and instead recovered ~$3.1M on contract and unjust enrichment theories plus an equitable transfer of Hamamatsu's nine U.S. patents — and, after reversal on cross-appeal, its Japanese priority applications and foreign counterparts. The Federal Circuit's precedential holding (foreign-patent assignment as an in personam remedy) is the case's lasting contribution.

1. Filing and initial pleadings (2015–2017)

Date Event
2015-10-01 SiOnyx, LLC and President & Fellows of Harvard College file suit against Hamamatsu Photonics K.K. ("HPK"), Hamamatsu Corp. ("HC"), Ocean Optics, Inc., and Does 1–10 in D. Mass., Civil Action No. 1:15-cv-13488-FDS (Judge F. Dennis Saylor IV). Complaint asserts Harvard's '446 and '467 patents (SiOnyx as exclusive licensee) and SiOnyx's '591 patent, plus breach of the 2007 NDA, unjust enrichment, and § 256 correction of inventorship as to nine HPK U.S. patents.
2017-05-08 Second Amended Complaint "deemed filed," asserting 24 counts (ECF 163-2): Counts 1–15 § 256 inventorship (

Plaintiff representatives

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

I'll research the counsel of record for SiOnyx LLC at both the district court and Federal Circuit levels.

Let me dig into the Federal Circuit docket and district court appearances for the full counsel roster.

Now let me pin down the district court appearances and any additional plaintiff-side counsel (including for Harvard).

Bottom line

SiOnyx (and co-plaintiff Harvard, which was a cross-appellant in the same appeal) was represented throughout by a single Boston-based team from Pepper Hamilton LLP, which after the 2020 Troutman Sanders–Pepper Hamilton merger appears in the Federal Circuit opinion as Troutman Pepper Hamilton Sanders LLP. William D. Belanger was the relationship/lead partner and the only plaintiffs' lawyer who argued at the Federal Circuit (Doc. 68, argued; opinion at 981 F.3d 1339). Four other Pepper lawyers appeared on the district-court record. No SiOnyx in-house lawyer appears as counsel of record in any opinion or filing I could access.

Counsel of record — plaintiff side

Attorney Role Firm / office Note
William D. Belanger Lead counsel (D. Mass.) and principal appellate advocate — argued Fed. Cir. No. 19-2359 Troutman Pepper Hamilton Sanders LLP (formerly Pepper Hamilton LLP), 125 High St., 19th Fl., High Street Tower, Boston, MA 02110 Argued both SiOnyx appeals — the 2020 merits appeal (981 F.3d 1339) and the earlier IPR appeal SiOnyx v. Hamamatsu Corp., No. 18-2019 (Fed. Cir. Apr. 3, 2019); listed as counsel on the § 285 fee and post-judgment motions.
Anthony H. Cataldo Of counsel / appellate team ("also represented by") Troutman Pepper Hamilton Sanders LLP (formerly Pepper Hamilton LLP), Boston Named in the Fed. Cir. opinion's counsel block and on Hamamatsu's Jan. 6, 2021 certificate of service (anthony.cataldo@troutman.com) as counsel for plaintiffs-cross-appellants.
Gwendolyn E. Tawresey Of counsel / appellate team Troutman Pepper Hamilton Sanders LLP (formerly Pepper Hamilton LLP), Boston Counsel block in 981 F.3d 1339; also appeared on the 18-2019 IPR appeal for SiOnyx (tawreseg@pepperlaw.com per the Jan. 2021 service list).
Maia H. Harris District court team member Pepper Hamilton LLP, Boston Listed among plaintiffs' counsel in the D. Mass. opinions (e.g., 330 F. Supp. 3d 574 (D. Mass. 2018)) and in the counsel table on the Fed. Cir. response brief.
Miranda Hooker District court team member Pepper Hamilton LLP, Boston Same listing; appeared for SiOnyx/Harvard in D. Mass. and named in the counsel table on the Fed. Cir. response.
David Michael Magee District court team member (early/likely not throughout) Pepper Hamilton LLP, Boston Appears in the counsel listing for the Aug. 30, 2018 summary-judgment opinion, 330 F. Supp. 3d 574; not in the Dec. 2020 Federal Circuit counsel block, so his involvement apparently ended before appeal.

Related PTAB counsel (not district-court counsel of record, but the same client team): in IPR2017-00909 on the '467 patent, the patent owner (Harvard/SiOnyx) designated Thomas J. Engellenner (Reg. No. 28,711, Pepper Hamilton LLP, Boston) as lead counsel with Reza Mollaaghababa as back-up, per the March 1, 2017 mandatory notice. Engellenner does not appear in the district-court or Federal Circuit counsel listings, so treat him as IPR counsel only.

Appearance by stage

  • D. Mass. No. 1:15-cv-13488-FDS (Saylor, J.), filed Oct. 1, 2015: plaintiffs SiOnyx LLC and President and Fellows of Harvard College represented by Belanger, Cataldo, Tawresey, Harris, Hooker (and Magee in 2018) — all Pepper Hamilton, Boston. Source: counsel listings in 330 F. Supp. 3d 574 (D. Mass. 2018) and 332 F. Supp. 3d 446 (D. Mass. 2018), and the July 25, 2019 interest order (ECF 803).
  • Fed. Cir. No. 19-2359 (and consolidated No. 20-1217): "WILLIAM D. BELANGER, Troutman Pepper Hamilton Sanders LLP, Boston, MA, argued for plaintiffs-cross-appellants. Also represented by ANTHONY H. CATALDO, GWENDOLYN TAWRESEY." The Federal Circuit's Jan. 7, 2021 rehearing-invitation letter is addressed to Belanger at 125 High Street, 19th Floor, Boston.
  • Earlier Fed. Cir. No. 18-2019 (IPR2016-01910 appeal): "WILLIAM D. BELANGER, Pepper Hamilton LLP, Boston, MA, argued for appellant. Also represented by GWENDOLYN TAWRESEY."

Caveats / what I could not verify

  • No PACER docket sheet for D. Mass. 1:15-cv-13488 was directly accessible to me, so I cannot give you ECF entry numbers for the individual notices of appearance, nor confirm formal "lead attorney" designations in the D. Mass. docket. The roster above is reconstructed from the counsel listings printed in the published D. Mass. opinions, the Federal Circuit opinion's counsel block, and the parties' Federal Circuit service certificates.
  • In-house counsel: I found no SiOnyx (or Harvard) in-house attorney listed as counsel of record at either level. Nothing suggests any plaintiff-side filing was sealed in a way that hides an appearance, but I did not review the full docket, so I can't rule it out.
  • Current firm/office for Harris and Hooker: I confirmed only their Pepper Hamilton (Boston) affiliation as of the 2018–2019 D. Mass. record. I did not verify their present firms, so I have not attributed current employers.
  • Role labels ("lead," "of counsel") are my characterization based on who argued, who signed the Federal Circuit briefs, and who is listed first in the opinions — not quotations from a docket entry.
  • Co-plaintiff note: the case as captioned in your metadata is SiOnyx LLC v. Hamamatsu Photonics K.K., but the appeal actually carried both SiOnyx and President and Fellows of Harvard College as plaintiffs-cross-appellants (981 F.3d 1339; Fed. Cir. Nos. 19-2359, 20-1217). The same Pepper/Troutman Pepper team represented both.

Defendant representatives

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

I'll research the counsel of record for Hamamatsu Photonics across the Federal Circuit appeal and the underlying D. Mass. litigation.

Let me dig into the Federal Circuit docket and briefs to confirm the full defense counsel list, and separately check the district court docket.

Let me pull the Federal Circuit docket page and the actual brief cover pages to verify the full appearance list.

Counsel of Record — Hamamatsu Defendants

SiOnyx LLC v. Hamamatsu Photonics K.K., No. 19-2359 (Fed. Cir.) (and cross-appeal No. 20-1217), on appeal from SiOnyx, LLC v. Hamamatsu Photonics K.K., No. 1:15-cv-13488-FDS (D. Mass.)

Defendants were Hamamatsu Photonics K.K. (HPK, Japan), Hamamatsu Corp. (HC, the U.S. distribution subsidiary), and Ocean Optics, Inc. The Federal Circuit appeal was prosecuted on behalf of HPK and HC.

Federal Circuit (No. 19-2359 / 20-1217)

Attorney Role Firm / Office Relevant experience
John D. Simmons Lead appellate counsel (Fed. Cir. docket designation "L1"); signed the combined petition for panel rehearing/en banc (Doc. 61, Jan. 6, 2021) as "Counsel for Defendants-Appellants" Panitch Schwarze Belisario & Nadel LLP, Two Commerce Square, 2001 Market St., Suite 2200, Philadelphia, PA Registered patent attorney and licensed professional engineer (EE); Past President of PIPLA (2017–18); led Hamamatsu's PTAB challenge that knocked out claims of Harvard's U.S. Patent 7,884,446; extensive patent docket across 25+ districts; previously at Akin Gump
Stephen E. Murray Appellate team / counsel of record (Reg. No. 63,206) Panitch Schwarze Belisario & Nadel LLP, Philadelphia, PA Member of the Hamamatsu PTAB team (IPR of the '446 and '467 patents); patent prosecution and post-grant practice
Keith A. Jones Appellate team / counsel of record (Reg. No. 67,781); also admitted pro hac vice in D. Mass. Panitch Schwarze Belisario & Nadel LLP, Philadelphia, PA Same Hamamatsu PTAB team; PIPLA board member; patent litigator
Koichiro Minamino Of counsel — Japanese client/language liaison; separately represented co-defendants Hamamatsu Corp. and Ocean Optics, Inc. Minamino Law Office, PLLC, 1300 I Street NW, Suite 900, Washington, DC Japanese-qualified IP practitioner with a U.S. office; recurring U.S. counsel for Japanese electronics/photonics clients; appeared pro hac vice in the D. Mass. case

District court (D. Mass. No. 1:15-cv-13488-FDS) — for context

Attorney Role Firm / Office Note
John D. Simmons, Stephen E. Murray, Keith A. Jones Trial counsel, pro hac vice Panitch Schwarze, Philadelphia Same core team as the appeal
Christopher A. Callanan Local counsel (D. Mass.) Stevenson McKenna & Callanan LLP, Boston, MA Local counsel of record for HPK through the 2019 post-trial rulings; no Federal Circuit appearance is reflected on the CAFC docket

Sourcing and caveats

  • Federal Circuit docket: the No. 19-2359 party/attorney listing shows "Panitch Schwarze Belisario Nadel LLP" with John D. Simmons, Stephen E. Murray and Keith A. Jones, plus "Minamino Law Office PLLC" / Koichiro Minamino (ex parte CAFC docket summary).
  • Briefs and rehearing papers: Doc. 61 (combined petition for panel rehearing/rehearing en banc, filed Jan. 6, 2021) is signed "/s/ John D. Simmons" and closes "Counsel for Defendants-Appellants" (petition PDF); the court's Jan. 7, 2021 invitation for response is addressed to William D. Belanger for cross-appellants, confirming Simmons as the defense-side lead (invitation letter).
  • D. Mass. appearances: the July 25, 2019 opinions list "Keith A. Jones, Panitch Schwarze Belisario & Nadel LLP, pro hac vice, Koichiro Minamino, Minamino Law Office, PLLC, pro hac vice & Christopher A. Callanan, Stevenson McKenna & Callanan LLP" for HPK, with Simmons for Hamamatsu Corp. (see, e.g., SiONYX, LLC v. Hamamatsu Photonics KK, No. 15-13488-FDS (D. Mass. July 25, 2019) counsel listing); the Oct. 24, 2019 notice of appeal certificate of service lists Simmons, Murray and Jones pro hac vice.
  • Trade press: VitalLaw's report on the decision attributes Hamamatsu's representation to "John David Simmons (Panitch Schwarze Belisario & Nadel LLP) for Hamamatsu Photonics K.K. and Hamamatsu Corp."
  • PTAB: Panitch's Feb. 2018 newsletter identifies Simmons, Murray and Jones as the team that won the PTAB ruling against Harvard's '446 patent; IPR2017-00909 (on the '467 patent) papers list all three with Philadelphia addresses (jsimmons@panitchlaw.com, smurray@panitchlaw.com, kjones@panitchlaw.com).

Not verified / open items: (1) I did not obtain a PACER docket sheet directly; the appearance list above is reconstructed from opinions, briefs, certificates of service and a CAFC docket mirror, so additional appearances (e.g., a later-added appellate associate) cannot be ruled out. (2) No Hamamatsu in-house attorney is publicly listed as counsel of record in either court; if one participated, it is not reflected in the public filings I could locate. (3) I could not confirm Callanan's continued role after the 2019 district court rulings or any CAFC appearance by him. (4) Firm names are given as they appear in the filings — Panitch Schwarze now styles itself "Panitch Schwarze Belisario & Nadel LLP" (the CAFC docket drops "& Nadel"); Minamino Law Office's DC address is from the appellate brief.