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:
Jul. 13, 1993
Filed:
May. 04, 1990
Applicant:
Inventors:
Scott R Fohrman, Wilmette, IL (US);
Steven L Smith, Chicago, IL (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03H / ;
U.S. Cl.
CPC ...
359-3 ; 359 15 ; 425542 ;
Abstract
A multidimensional, visually readable, diffractive surface grating such as a hologram is reproduced by providing a master grating, generating a negative image plate from the master grating for insertion into a forming device, and replicating the master grating in plasticizable material in the forming device so as to provide a directly visually readable grating.