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:
Oct. 05, 1982
Filed:
Mar. 23, 1981
Applicant:
Inventor:
Jasper D Barber, Charlotte, NC (US);
Assignee:
Charlotte Pipe and Foundry Company, Charlotte, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
425525 ; 264573 ; 425533 ; 4253871 ; 425D / ;
Abstract
The internal core of a molding apparatus does not have to be axially moved for molding a plastic pipe provided with a peripheral groove therein. This is accomplished by providing the internal core with a groove of such narrow width as to always be open to the surrounding cooperating mold body while at the same time preventing plastic material from entering the groove as the plastic material is being introduced into the mold cavity.