Epson Portland Inc. is the United States manufacturing subsidiary of Japan’s Seiko Epson Corporation (SEC). Using proprietary ... Epson robotics, EPI’s Hillsboro, Oregon, location currently manufactures ink cartridges for Epson ink jet printers, produces ink to fill Epson cartridges, performs precision injection molding of proprietary plastic parts, and provides specialized engineering services. EPI’s Longview, Washington, location manufactures synthetic quartz crystals for Epson’s Micro-Device Division. The quartz is used in electronic products manufactured by Epson affiliates around the world. United States Epson affiliates including Epson America, Inc. and Epson Electronics America, Inc. market, sell, and distribute Epson products throughout the Americas. Epson Portland Inc. is certified under ISO 9001 and ISO 14001. read more