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:
Apr. 10, 1990
Filed:
Jul. 25, 1988
Robert N Goldman, Honolulu, HI (US);
Light Signatures, Inc., Los Angeles, CA (US);
Abstract
A system for reliably recording digital data on marginal magnetic recording medium by utilizing a two-track format and testing to locate pairs of record-quality areas of the medium. A magnetic stripe on a document is defined into a pair of recording tracks each with a sequence of bit locations. Associated pairs of bit locations (one from each track) are jointly tested for recording quality. One bit location of poor quality eliminates the pair; however, if both bit locations meet a standard, they are employed cooperatively to record data. Specifically, each bit location initially is recorded with a pulse. Any pair of bit locations which cannot meet the standard is totally cleared (erased), while pairs of bit locations meeting the standard are selectively erased to represent digital data.