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. 05, 1995
Filed:
Jan. 25, 1993
Applicant:
Inventor:
Campbell H Steketee, Jr, Salem, OR (US);
Assignee:
NuPipe, Inc., Memphis, TN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264 36 ; 138 97 ; 264230 ;
Abstract
A thermoplastic pipe in a reduced shape having a memory for the reduced shape is heated to make it pliable for installation in an existing conduit to be lined. The pipe is then expanded by passing a heated fluid into a pipe, or by the use of an inflatable plug or rounding device. The length of pipe which has been installed can be removed by heating to a pliable state to cause the pipe to return at least partially to its reduced form and remove. This ability to remove an installed length of replacement pipe allows for removal of a replacement pipe which is damaged.