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. 10, 1991
Filed:
Jan. 12, 1990
Applicant:
Inventors:
Bruce Cowger, Corvallis, OR (US);
John H Dion, Corvallis, OR (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41J / ;
U.S. Cl.
CPC ...
3461 / ; 401223 ;
Abstract
Ink contained in a pen reservoir (12) is subject to the capillarity provided by an array of spaced apart capillary members (10). The capillarity provided by the capillary members (10) is sufficient for establishing a back pressure at the print head (18) of the pen (14) to thereby avoid leakage of ink from the reservoir (12) whenever the print head (18) is inactive.