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:
Dec. 25, 2000
Filed:
Sep. 13, 1994
Applicant:
Inventor:
Mark Hauck, Corvallis, OR (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J / ;
U.S. Cl.
CPC ...
347-6 ; 347 85 ;
Abstract
The accumulator system includes minute pump and transducer mechanisms carried on the pen for regulating changes in the back pressure of the pen reservoir. One pump inflates a bag that is carried inside the reservoir. Another pump deflates the bag. The pumps are selectively controlled, in response to pressure changes detected by the transducer mechanism.