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. 20, 1983
Filed:
Jun. 17, 1982
Applicant:
Inventors:
Takeo Kudo, Suita, JP;
Yasutaka Okada, Nishinomiya, JP;
Taishi Moroishi, Kobe, JP;
Akio Ikeda, Hyogo, JP;
Hiroo Ohtani, Kobe, JP;
Kunihiko Yoshikawa, Suita, JP;
Assignee:
Sumitomo Metal Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C / ;
U.S. Cl.
CPC ...
148 / ; 148 / ; 148 / ; 420448 ; 420452 ;
Abstract
A process for manufacturing high strength deep well casing, tubing, and drill pipes, which have improved resistance to stress corrosion cracking is disclosed. The process comprises the steps of preparing an alloy composition which is: