"Does 1–10" is not a company. It is a procedural placeholder — the standard "John Doe" designation used in U.S. federal pleadings for defendants who have not yet been identified or served. No entity by this name exists, so no company overview, headquarters, ownership, or product line can be verified. The single tracked "case" below reflects a docketing artifact, not a real party.
Where the name comes from. The caption in this matter is SiOnyx, LLC and President and Fellows of Harvard College v. Hamamatsu Photonics K.K., Hamamatsu Corp., Ocean Optics, Inc., and Does 1–10 (D. Mass. No. 1:15-cv-13488-FDS, filed Oct. 1, 2015, Judge F. Dennis Saylor IV). "Does 1–10" appears because the plaintiffs reserved the right to name up to ten additional unidentified defendants, presumably downstream sellers or distributors of accused products. None appears to have been identified; the case was litigated against the named Hamamatsu entities and Ocean Optics.
Actual parties and subject matter. SiOnyx (Beverly, Massachusetts), founded around 2005–2006 by Harvard researchers Eric Mazur and James Carey, develops and sells laser-textured "black silicon" photodetectors and short-wave infrared sensors; Harvard is the assignee of the asserted '467 patent, exclusively licensed to SiOnyx. Hamamatsu Photonics K.K. is a Japanese photonics manufacturer of optical devices and image sensors; Hamamatsu Corp. (Bridgewater, New Jersey) is its wholly owned North American sales subsidiary under Photonics Management Corp.
Case context and posture. SiOnyx sued on breach of a 2007 mutual NDA, unjust enrichment, infringement of the '467 patent, and correction of inventorship/ownership of nine Hamamatsu US patents (plus foreign counterparts). A May 2019 jury verdict favored SiOnyx; the July 26, 2019 final judgment awarded $1,887,950 (contract) and $1,241,176 (unjust enrichment), transferred ownership of the nine US patents, and enjoined Hamamatsu. The Federal Circuit affirmed in material part in December 2020, including ownership of the disputed foreign patents; Hamamatsu sought panel rehearing in January 2021, and costs were resolved in May 2021 for $53,481.45.
Litigation posture note. The case data's defendant count for "Does 1–10" reflects only that placeholder caption. Treat this record as belonging to SiOnyx and Hamamatsu, not to a distinct litigant.