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:
Mar. 03, 1992
Filed:
Nov. 16, 1990
Applicant:
Inventors:
Peter Lichtinger, Furstenfeldbruck, DE;
Gabrial Ringelstetter, Munich, DE;
Assignee:
Krauss-Maffei Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
425546 ; 264107 ; 425810 ; 425812 ;
Abstract
A bushing for the axial retention and radial centering of a matrix in an injection mold for producing information carriers such as CD's is formed on the underside of its retention shoulder with channels for carrying away the air which tends to be compressed along the outer edge of the shoulder, thereby eliminating streaks or so called schlieren in the information-carrier disk which is produced.