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:
Aug. 12, 1986
Filed:
Feb. 28, 1985
Applicant:
Inventor:
Ronald A Ferrante, Senecaville, OH (US);
Assignee:
NCR Corporation, Dayton, OH (US);
Primary Examiner:
Int. Cl.
CPC ...
G03H / ; G03H / ;
U.S. Cl.
CPC ...
430-2 ; 430-1 ; 430-4 ; 430321 ; 350-38 ; 350-386 ; 350-367 ; 372-9 ;
Abstract
A method for constructing an optical filter for use in a holographic scanner includes exposing a photographic film to a laser, developing the film and reinserting the developed film into the unexpanded output beam of the laser to provide a uniform illumination of the outputted beam. The filter is positioned in the reference beam in the construction of a hologram used in the holographic scanner.