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. 13, 1979
Filed:
Dec. 27, 1977
Applicant:
Inventor:
Robert K Stephens, Windham, NH (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ; G03C / ; G03C / ; G11B / ;
U.S. Cl.
CPC ...
96-3 ; 96-4 ; 96 2 / ; 96 39 ; 96 7 / ; 274 / ; 274 / ; 274 / ; 352 26 ; 352 27 ;
Abstract
A photographic sound recording and reproduction method is disclosed wherein a sound track is formed by silver diffusion transfer processing. Film units suitable for this application are described which comprise a support, a layer containing silver precipitating nuclei, and a layer containing photosensitive silver halide crystals. In one embodiment, a photographic sound track may be produced in a silver diffusion transfer color motion picture film unit, which further comprises an optical color screen.