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:
Oct. 30, 1979
Filed:
Feb. 23, 1978
Applicant:
Inventor:
Chandler R Deming, San Diego, CA (US);
Assignee:
Cubic Western Data, San Diego, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 44 ; 235482 ; 235493 ;
Abstract
In the disclosed method, pre-recorded bit markers are read from a magnetic medium as it is moved by hand at a highly variable speed past a magnetic read head. Pulses of a fixed frequency are counted between the reading of adjacent ones of the bit markers. Magnetic flux is written in one direction on the medium upon the reading of the bit markers; and magnetic flux is written in an opposite direction after a time period equal to a fraction of the number of pulses counted between bit markers times the reciprocal of the fixed frequency. Also disclosed is apparatus for performing the steps of the disclosed method.