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. 19, 2019
Filed:
Dec. 24, 2014
Applicant:
Kureha Corporation, Tokyo, JP;
Inventors:
Takeo Takahashi, Tokyo, JP;
Masayuki Okura, Tokyo, JP;
Assignee:
KUREHA CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 33/128 (2006.01); E21B 33/12 (2006.01); C09J 167/00 (2006.01); E21B 43/26 (2006.01); C09K 8/42 (2006.01);
U.S. Cl.
CPC ...
E21B 33/1208 (2013.01); C09J 167/00 (2013.01); E21B 33/128 (2013.01); E21B 43/26 (2013.01); C09K 8/426 (2013.01);
Abstract
A degradable seal member for downhole tools, the member being a diameter-expandable annular seal member, the diameter-expandable annular seal member comprising: two or more annular members distributed along an axial direction, the annular members being formed from a degradable polymer material having hardness in a range from A60 to D80; a plug for well drilling; and a method for well drilling using the degradable seal member for downhole tools.