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:
Dec. 26, 1978
Filed:
Oct. 26, 1977
Pepe Siy, Dearborn Heights, MI (US);
Joseph R Brown, Riverview, MI (US);
Burroughs Corporation, Detroit, MI (US);
Abstract
A pressure-sensitive writing stylus and associated circuitry for use in a personal identification system that uses handwriting pressure as an identifying discriminant. The stylus includes a housing, and a cartridge mounted within the housing. A capacitive transducer, preferably a piezoelectric crystal, is mounted contiguous with the upper end of the cartridge and is responsive to axial loading forces in the cartridge caused by contact of the cartridge tip against a writing surface. The transducer outputs a signal related to the time rate of change of the loading force or pressure. The associated circuitry receives the transducer output signal and amplifies and integrates it in successive stages to produce an output signal directly related to the user's handwriting pressure.