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. 07, 1998
Filed:
Mar. 05, 1996
Norman Pawlowski, Jr, Corvallis, OR (US);
Melissa D Boyd, Corvallis, OR (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
The present invention relates to free-ink type ink-jet pens. A dual-chambered housing forms ink accumulators which provide a local supply of ink for a printhead mechanism. The accumulators are fluidically coupled to an off-board ink reservoir by a valve mechanism. A pressure regulator mechanism is incorporated into a chamber for maintaining a predetermined gage set point back-pressure within the pen and for regulating the flow of ink from the reservoir by controlling the valve mechanism. A near linear force by biasing the regulator mechanism so as to balance it against a force exerted thereon by the ambient atmosphere via a vent when the valve mechanism is opened due to a force exerted by a differential between ambient atmospheric pressure and the bias force. The mechanism is insensitive to the rate of flow of ink through the valve.