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. 19, 1986
Filed:
Jan. 14, 1985
Jeri L Gerber, Lexington, KY (US);
Jorge L Nazario, Lexington, KY (US);
Victor M Simi, Lexington, KY (US);
International Business Machine Corp., Armonk, NY (US);
Abstract
Cartridge (1) contains memory (40a-40h) and a back-up battery (13). Terminals (5a-5i) of the cartridge (1) plug into termnals (7a-7i) of a host machine (3). Positive deactivation of the write control is achieved by both the base and emitter of a bipolar transistor (52) being deactivated when the cartridge (1) is unplugged. Battery voltage then appears at read/write control line (64) through resistor (56) connected to the collector of the transistor (52). This brings the control line (64) to the read status and positively protects data in memory (40a-40h) against transient signals, which may occur especially during plug in when the host (3) is activated, or from electrostatic charges.