The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 25, 1999
Filed:
Nov. 10, 1994
Edward B Evans, St. Louis, MO (US);
Jimmy L Droit, St. Peters, MO (US);
Donald D Porter, Bridgeton, MO (US);
Diagraph Corporation, Herrin, IL (US);
Abstract
A printhead for ink jet printing apparatus having a plurality of orifices for delivery of droplets of ink with delivery controlled by miniature solenoids, one for each orifice, each solenoid having a plunger directly engageable with a membrane to block flow of ink to a respective orifice and electromagnetically retractable from the membrane for flow of ink for delivery of a droplet of ink from the respective orifice, with provision for proportional valve action for each orifice. A removable and replaceable dot mask plate having a pattern of holes is sandwiched between a body and a back plate of the printhead and certain of the plungers of the solenoids are aligned with holes in the dot mask and, in a forward extended position, extend through the holes to engage the membrane. The dot mask masks or blocks other plungers of the printhead.