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:
Jun. 29, 1976
Filed:
Nov. 27, 1974
Applicant:
Inventors:
Keith Douglas Ridler, Fulbourn, EN;
Colin Howard Stanwell-Smith, Balsham, EN;
Assignee:
Strathearn Audio Limited, Belfast, EK;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
356156 ; 250571 ; 274 / ; 274 / ; 356201 ; 356209 ;
Abstract
The presence and size of a recorded disc on a turntable is detected and indicated by the interruption of a beam or beams of energy which passes in the plane of the disc, through a hole or holes in a turntable, or beneath the turntable.