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:
Nov. 14, 1978
Filed:
Aug. 25, 1977
Applicant:
Inventor:
Richard G Stevenson, Jr, Palo Alto, CA (US);
Assignee:
Silonics, Inc., Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
3461 / ; 73708 ; 219496 ; 219499 ; 323 / ;
Abstract
An electronic circuit for sensing and controlling the pressure and temperature of ink within an ink jet print head. Ink pressure is monitored by a pair of strain gauges electrically connected into a bridge whose output controls an ink supply valve. Part of that bridge is utilized with additional elements to form a second bridge for monitoring through one of the strain gauges the temperature of the ink jet head, accompanied with a heater of the head that is driven from the temperature signal to maintain the head temperature above a preset temperature.