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. 26, 1991
Filed:
Dec. 18, 1989
Applicant:
Inventors:
Bernard J Lechner, Princeton, NJ (US);
Graham S Stubbs, Poway, CA (US);
Eugene Leonard, Sands Point, NY (US);
Assignee:
Eidak Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
380-5 ; 380 10 ; 380 14 ; 360 60 ;
Abstract
A system and method for encoding an optional video disc to inhibit unauthorized recording of played back signals by conventional videotape recorders is provided. A source program is mounted on a video signal generating means. The video signal is modified by increasing and decreasing time durations from a standard horizontal line duration of pre-established maximums and minimums. The modified video signal is recorded on a previously blank optical video disc.