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:
Aug. 24, 1982
Filed:
Jun. 13, 1980
Robert A Wiley, Richardson, TX (US);
The Mead Corporation, Dayton, OH (US);
Abstract
A fluid supply system for an ink jet print head includes a recirculating path through a fluid pump, an inertial filter, and a variable restriction valve. Filtrate effluent from the inertial filter passes from the recirculating fluid path through a fixed restriction to the fluid supply line for the print head. The pressure drop across the fixed restriction is monitored and is utilized to control adjustment of the variable restriction valve in the recirculating fluid path such that the flow rate to the print head supply line is held constant. By this arrangement, the fluid within the print head may be maintained at a constant pressure level without the need for a pressure monitoring device directly associated with the print head.