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:
Sep. 25, 2001
Filed:
Apr. 22, 1998
Applicant:
Inventor:
David Pidwerbecki, Corvallis, OR (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J 2/05 ;
U.S. Cl.
CPC ...
B41J 2/05 ;
Abstract
An ink jet print head apparatus having a reduced thickness passivation layer. Passivation layer thickness is preferably below 7000 angstroms to permit operation at a lower turn-on-energy. The passivation layer is preferably formed in a discrete manner and may include a nitride layer and a SiC layer. Various other layer arrangements are also described including the provision of a cavitation layer over the passivation layer. A thermal or other type of ink expulsion mechanism may be utilized.