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:
Feb. 28, 2006
Filed:
Mar. 31, 2003
Applicant:
Michael Cunningham, Spring, TX (US);
Inventor:
Michael Cunningham, Spring, TX (US);
Assignee:
Oceaneering International, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B08B 9/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
This invention relates to a hydraulic pig advance system comprising a control volume chamber containing hydraulic fluid and a force transmitting member. The system further comprises two directional control valves which can be selectively repositioned to cause hydraulic fluid to cycle the force transmitting member back and force such that in each cycle, a metered amount of hydraulic is transmitted into a pig housing where it causes a pig to move a predetermined distance.