Defendant
4 cases as defendant.
Seiko Epson Corporation (Epson)
Full legal name Seiko Epson Corporation; trades as "Epson." Founded May 18, 1942; headquartered at 3-3-5 Owa, Suwa, Nagano, Japan (registered head office in Tokyo). Publicly listed on the Tokyo Stock Exchange Prime market (ticker 6724), with ADRs/OTC lines (e.g., SEKEY). It is not a subsidiary and has no single controlling parent; Seiko Group and the Hattori family interests are significant shareholders but do not control the company. Per Epson's own company outline, FY ended March 31, 2026 revenue was ¥1,413.3 billion (~US$9–9.5bn depending on rate) with 74,619 consolidated employees and 88 group companies. Third-party data put market cap around $7.5bn (approximate; treat as indicative).
Products / operations
Epson is an operating manufacturer, not an NPE. Its segments and representative lines are: Precision Innovation (inkjet printheads, quartz crystal devices, CMOS semiconductors, fine metal powders); Industrial & Robotics (commercial and industrial inkjet printers, POS printers, serial impact dot matrix printers, PaperLab dry papermaking systems, industrial robots); Office & Home Printing (inkjet printers, label printers, scanners, consumables); and Visual & Lifestyle (3LCD projectors, smart glasses, wristwatches and watch movements, PCs).
Patent-litigation posture
Pure defensive. Epson appears in the tracked data only as a defendant (0 plaintiff cases, 4 defendant cases), the classic profile of an operating company targeted by an asserting entity. All tracked suits are RAH Color Technologies LLC v. Seiko Epson Corp. et al., filed December 20–21, 2010.
Notable cases / context
The RAH Color Technologies suits were filed in the U.S. District Court for the Western District of New York (Rochester), the plaintiff's home district rather than a plaintiff-friendly Texas venue. RAH Color Technologies is a Rochester, New York LLC associated with inventor Dr. Richard A. Holub that asserts color-management and color-reproduction patents; the Epson complaint named Seiko Epson plus U.S. Epson, Epson America, and Epson Portland, and targeted Epson printers, scanners, spectrophotometer-equipped proofing systems, and Print Image Matching technology. Epson counterclaimed. The same portfolio was asserted separately against Adobe, Microsoft, HP, EFI, and Heidelberg, prompting PTAB inter partes reviews. No merits outcomes are asserted here.
Patent infringement suit involving US 7,791,761. Defendants filed counterclaims in April 2011; the specific disposition was not confirmed.
RAH Color Technologies LLC sued Seiko Epson Corp. and affiliated Epson entities in the Western District of New York. The case was identified as the first worldwide family litigation filed and was closed, with resolution consistent with licenses RAH later admitted to California-based Epson entities.
RAH Color Technologies sued Seiko Epson and related Epson entities; earliest identified '870 suit; outcome not confirmed.
RAH Color Technologies LLC asserted the '546 patent against Seiko Epson Corp. and affiliated Epson entities. Defendants filed answers/counterclaims in 2011, and the case closed without a reported merits judgment.