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:
Aug. 23, 1994
Filed:
Nov. 30, 1992
Applicant:
Inventors:
Yasuaki Hashimoto, Tagata, JP;
Tadahiro Uematsu, Numazu, JP;
Assignee:
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B23P / ; B24B / ; B24B / ;
U.S. Cl.
CPC ...
295266 ; 295276 ; 51 3 / ; 51 4 / ; 51290 ; 82-111 ; 408 53 ; 409244 ;
Abstract
A method of manufacturing a thick-walled small diameter pipe by repeating a process comprising a pipe extension process and a heating process on a pipe to be processed plural times, wherein a machining process on the inner circumferential surface of said pipe to be processed is performed prior to the pipe extension process in the final cycle of said process or a process near the final cycle to remove a black skin layer, cracks and puckers, providing smooth inner surface and excellent proof pressure.