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:
Sep. 12, 1978
Filed:
Aug. 18, 1976
Applicant:
Inventor:
Hideo Iida, Sagamihara, JP;
Assignee:
Nippon Hume Pipe Company Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B28B / ; B28B / ; F16L / ;
U.S. Cl.
CPC ...
264228 ; 138176 ; 264256 ; 264311 ;
Abstract
A method of manufacturing prestressed concrete pipe which comprises arranging a reinforcing cage in a form, casting expansive concrete within the form in such a manner that the reinforcing cage is disposed outwardly of the center of the wall thickness of the concrete layer, and then forming the pipe centrifugally.