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. 09, 1983
Filed:
Jun. 18, 1981
Applicant:
Inventors:
William Bindloss, Wilmington, DE (US);
Fredrick C Zumsteg, Jr, Wilmington, DE (US);
Assignee:
E. I. Du Pont De Nemours & Co., Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
430 39 ; 346 744 ; 360 59 ;
Abstract
In forming a latent magnetic image by imagewise demagnetization of a magnetized layer, less than the entire thickness of the exposed area is demagnetized so as to induce a magnetization of opposite polarity in the demagnetized area, thus reducing the net strength of the residual and induced magnetic fields within the exposed areas.