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. 17, 1999
Filed:
Jul. 17, 1997
Kurt A Dykema, Holland, MI (US);
Prince Corporation, Holland, MI (US);
Abstract
A latching circuit is coupled to the vehicle's power supply and to a trainable transmitter microprocessor such that upon initial training, the latch is set to maintain a logic level signal to the microprocessor for enabling the microprocessor once initially trained. If, however, the power is removed from the latch circuit and reapplied, as may occur if the trainable transmitter is removed from the vehicle, the latch circuit will provide a different logic level signal to the microprocessor either disabling the transmit function for the microprocessor or erasing the code stored in the nonvolatile memory. The trainable transmitter, thus, will not be useful unless retrained utilizing the homeowner's original transmitter. The invention, the latch circuit includes a pair of MOSFETs with a very low current drain coupled in a flip-flop configuration such that their operational state will reverse once set upon removal and reapplication of power.