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:
Dec. 13, 1994
Filed:
Dec. 14, 1992
Applicant:
Inventor:
LaVaun S Merrill, Jr, Englewood, CO (US);
Assignee:
Marathon Oil Company, Findlay, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
166369 ; 166187 ; 166370 ; 166387 ;
Abstract
A method and apparatus for sealing a section of screened well casing, especially useful in soil venting wells. A foamed rubber sleeve surrounding a pipe is caused to collapse when suction is drawn on the annulus between the pipe and sleeve, allowing the pipe and sleeve to be lowered into place. When the annulus is pressurized the sleeve expands out against the screen to seal the contacted portion against the passage of air.