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:
Oct. 16, 2001
Filed:
Feb. 20, 1998
Applicant:
Inventor:
John D. Muchow, Sugar Land, TX (US);
Assignee:
Hydril Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E03B 1/00 ;
U.S. Cl.
CPC ...
E03B 1/00 ;
Abstract
A rotary valve is opened and closed with a combination incremental rachet mechanism and a continuous motor mechanism. Two separate control circuits are used for opening and closing the valve. When the opening or closing circuit is energized alone, the valve is incrementally opened or closed by the ratchet respectively. When the opening circuit is energized and the closing circuit is subsequently energized, the valve is continuously opened by the motor. Likewise, when the closing circuit is energized and the opening circuit is subsequently energized, the valve is continuously closed by the motor.