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:
Feb. 09, 1976
Applicant:
Inventors:
Donald R Bowker, Cerritos, CA (US);
Donald J Klein, Downey, CA (US);
Stephen E Rados, Norwalk, CA (US);
Assignee:
Philips Industries Inc., Dayton, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29F / ; B29C / ; B29D / ;
U.S. Cl.
CPC ...
264295 ; 264318 ; 264320 ; 264336 ;
Abstract
Method of making grooved, bell-ended thermoplastic pipe. In order to remove the core from undercuts, most of the molded article is cooled until substantially rigid while the bell-end is cooled more slowly. The article is ejected from the mold while the bell end is still soft enough to be deformed during ejection but recovers its shape after removal from the mold.