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. 26, 1997
Filed:
Oct. 17, 1995
Hidefumi Nishigai, Ebina, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
Metal fibers are mixed, at a predetermined mixing ratio, into a document for which forgery should be prevented. In reading a document, microwaves are applied to the document via a transmission antenna and reflected microwaves are received via a reception antenna. The document includes a portion in which the microwave reception level falls within a predetermined range and which portion is longer than a predetermined length, the document is regarded as a forgery preventive document and the copying operation is stopped. Further, a registration guide is so formed as to reflect microwaves at a certain reflectance. Influences of variations due to a temperature change and aging are compensated by measuring a reception level corresponding to the registration guide.