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:
Feb. 10, 1976
Filed:
Sep. 07, 1973
Applicant:
Inventors:
Dieter Alwes, Hilchenbach-Dahlbruch, DT;
Helmut Eckardt, Hilchenbach-Dahlbruch, DT;
Hans Peter Leiste, Kirchhundem, DT;
Robert Albert Melcher, Wenden-Gerlingen, DT;
Assignee:
Siemag Siegener Maschinenbau GmbH, Hilchenbach-Dahlbruch, DT;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B29B / ;
U.S. Cl.
CPC ...
259191 ; 259-8 ;
Abstract
The invention is concerned with an injection molding apparatus in which thermoplastic material mixed with an expanding agent is kept in a plastic state below the reaction temperature of the agent and is passed generally continuously through an inter-connecting passage to a transfer cylinder; by flowing through the passage, the mass is heated above the reaction temperature and the built-up pressure prevents foaming of the thermoplastic until it is injected into a mold.