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. 12, 2021
Filed:
Jun. 06, 2019
Applicant:
Kureha Corporation, Tokyo, JP;
Inventors:
Fuminori Kobayashi, Tokyo, JP;
Hikaru Saijo, Tokyo, JP;
Assignee:
Kureha Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/42 (2006.01); C08K 5/1539 (2006.01); C08L 77/10 (2006.01); C08L 79/08 (2006.01); E21B 33/134 (2006.01);
U.S. Cl.
CPC ...
C09K 8/426 (2013.01); C08K 5/1539 (2013.01); C08L 77/10 (2013.01); C08L 79/08 (2013.01); E21B 33/134 (2013.01);
Abstract
A downhole tool that has a high initial compressive strength, can maintain compressive strength for a certain period of time, and is rapidly degradable after use. The downhole tool is formed from a degradable resin composition containing a polyamide resin and a carboxylic acid anhydride, and the carboxylic acid anhydride is a compound satisfying the following melting point condition:melting point of polyamide resin≤5% weight reduction temperature of carboxylic acid anhydride.