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:
May. 10, 1977
Filed:
Apr. 24, 1975
Applicant:
Inventors:
Keith Douglas Ridler, Cambridge, EN;
Gordon Malcolm Edge, Saffron Walden, EN;
Robert Charles Whelan, Comberton, EN;
Assignee:
Strathearn Audio Limited, Belfast, EK;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F / ; G11B / ;
U.S. Cl.
CPC ...
335219 ; 274 / ; 274 / ; 335180 ;
Abstract
The vertical movement of a phonograph pick-up arm is controlled magnetically or electro-magnetically by means including a body of magnetic material attached to the arm and magnetic field producing means arranged to exert a force on the body.