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. 19, 1989
Filed:
Jul. 28, 1987
Applicant:
Inventor:
Campbell H Steketee, Jr, Salem, OR (US);
Assignee:
Nu-Pipe, Inc., Nashville, TN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ; B29C / ;
U.S. Cl.
CPC ...
264 36 ; 264269 ; 264322 ; 264516 ; 425384 ; 4253871 ; 425503 ; 156287 ; 138 97 ;
Abstract
A thermoplastic pipe in a flattened and folded shape and of selected characteristics is formed by manufacturing it in this reduced shape. It is inserted in the flattened and folded shape and in a pliable state into a pipeline to be lined. It is then expanded and when set serves as a rigid or semi-rigid pipe within a pipeline capable of withstanding external hydrostatic and earth pressures. The thermoplastic pipe is heated during its installation for installing it into an existing pipeline and for expanding it.