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. 13, 1988
Filed:
Jul. 06, 1987
William R Heathe, Mississauga, CA;
Husky Injection Molding Systems Ltd., Bolton, CA;
Abstract
The present invention relates to a barrier screw having improved solids conveying capability. The barrier screw comprises a feed zone having a helical primary flight defining a solid material feed path, a transition zone for converting the solid material into molten material having a solids channel and a melt channel, and a metering zone for mixing molten plastic material from the melt path. In the feed zone, the helical flight defining the feed path is characterized by a substantially constant leading edge pitch and a trailing edge pitch which causes the thickness of the flight to increase as one moves along the screw barrel toward the beginning of the melt channel in the transition zone.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile