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:
Jul. 10, 1990
Filed:
Aug. 08, 1989
Applicant:
Inventors:
Mindy A Hamlin, Oceanside, CA (US);
George Kaplinsky, San Diego, CA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ; G01F / ;
U.S. Cl.
CPC ...
3461 / ; 116227 ;
Abstract
In an ink-jet printer, a ball check-valve (32) is used over the ink outlet (28) of an ink bag (16) to interrupt the flow of ink and/or air to the ink bladder when the ink supply in the bag falls below a predetermined level (40). The specific gravity of the ball is less than the specific gravity of ink in the bag but greater than the specific gravity of air.