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. 23, 1990
Filed:
Apr. 13, 1989
William R Menyhert, St. Petersburg Beach, FL (US);
Security Tag Systems, Inc., St. Petersburg, FL (US);
Abstract
A process for making a paper product that includes both means for preventing images from being copied from the paper product by use of a xerographic photocopier; and means for enabling detection of the paper product when the paper product is transported through an interrogation zone of an article surveillance system. The process includes the steps of (a) mixing paper ingredients with a material selected from a group of materials that either respond to light within a predetermined portion of the light spectrum by flooding the light sensing means of the photocopier so as to obsure any image defined by print on the paper product, or totally absorb light within the predetermined portion of the light spectrum so that no light is received from the paper product by the light sensing means of the photocopier; (b) mulching the mixture of step (a); (c) embedding in the mulch during step (b) means for producing a unique signal in response to an interrogation signal; and (d) drying the mulched mixture of step (b) to provide a sheet of the mulched mixture. The embedded means include a heat-treated amorphous magnetostrictive wire that responds to magnetic reversal by producing a high amplitude signal over a wide range of harmonics of the magnetic reversal frequency.