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. 31, 1976
Filed:
Nov. 29, 1974
Applicant:
Inventors:
John V Nowicki, St. Paul, MN (US);
John D Hakanson, South St. Paul, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
358 10 ; 1521 / ; 178D / ; 274 47 ; 358-4 ; 360128 ; 360132 ;
Abstract
Magnetic heads of color video tape recorder (vtr) machines are cleaned without harmful abrasion by means of a novel magnetic head cleaning tape carrying a color bar signal. Abrupt appearance of the color bar test pattern at the video monitor permits cessation of the cleaning operation immediately upon complete removal of foreign matter and without harmful abrasion of the heads.