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:
Nov. 06, 1990
Filed:
Jan. 23, 1989
Applicant:
Inventors:
Peter Heilmayr, McPherson, KS (US);
Kenton Gearhart, Moundridge, KS (US);
Assignee:
American Maplan Corporation, McPherson, KS (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
138162 ; 138157 ; 138128 ; 138166 ;
Abstract
A secondary confinement pipe is assembled from identical segments of extruded polyvinylchloride with tenon and groove formations along longitudinal edges enabling the segments to be interfitted. The joints are sealed by flexible synthetic resin coextruded with one of the formations at respective edges.