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:
Jan. 29, 1991
Filed:
Sep. 07, 1989
William R Heathe, Mississauga, CA;
Hartmut Roetzel, Rameldange, DE;
Husky Injection Molding Systems Ltd., Bolton, CA;
Abstract
The improved check valve assembly includes a cylindrical barrel, a rotating and reciprocating plasticizing feed screw in said barrel, a screw tip or head portion downstream of the feed screw and connected thereto with the feed screw feeding heated thermoplastic material to the screw tip which in turn feeds the material externally of the screw tip, a check valve assembly between the feed screw and the screw tip including a sliding ring inside the barrel, a first sealing surface of the ring sealable against the feed screw operative to block communication between the feed screw and screw tip, and means operative to seal the ring against the feed screw upon rotation of the feed screw.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile