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:
Nov. 14, 1978
Filed:
Jun. 27, 1977
Applicant:
Inventor:
Alex Nyfeler, Baar, CH;
Assignee:
LGZ Landis & Gyr Zug AG, Zug, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
219388 ; 219216 ; 219243 ; 219244 ; 350-361 ; 350-369 ;
Abstract
An apparatus for impressing relief patterns of high resolution, particularly phased holograms or phased diffraction gratings, in a thermoplastic information carrier, comprises a heatable impressing matrix in strip form, which carries the relief pattern and which, together with the information carrier, is passed between two calender rollers, the impressing matrix being adapted to be heated by a current flowing through it.