https://patentbrief.org/company/hewlett-packard-co Plain-English explanations of patents assigned to Hewlett Packard Co, newest first. en-us Sat, 13 Jun 2026 10:09:05 GMT https://patentbrief.org/patent/us/4490728/thermal-inkjet-printing Hewlett-Packard's 1982 patent on a two-stage electrical pulse method that preheats ink before vaporizing it, allowing thermal inkjet printers to reliably eject precise droplets without clogging. Tue, 25 Dec 1984 00:00:00 GMT https://patentbrief.org/patent/us/4490728/thermal-inkjet-printing