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:
May. 04, 1999
Filed:
Dec. 12, 1997
Applicant:
Inventor:
Steven C Quarre, Redmond, WA (US);
Assignee:
Applied Precision, Inc., Issaquah, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ; F16K / ;
U.S. Cl.
CPC ...
2511292 ; 251251 ;
Abstract
A cam actuated valve method and apparatus utilize an electronically controlled stepper motor driving a cam. A diaphragm type low flow, high accuracy diaphragm valve is positioned off axis with respect to the cam. A transmission translates linear motion of the cam to the valve diaphragm. High accuracy is maintained because the transmission is preloaded by pressure within the valve and the valve diaphragm.