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:
Mar. 08, 1994
Filed:
May. 29, 1991
Applicant:
Inventors:
Tomotaka Kurozu, Kanagawa, JP;
Mikio Takeuchi, Kanagawa, JP;
Assignee:
Nissan Motor Company, Ltd., Yokohama, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08C / ; B60R / ; G01S / ;
U.S. Cl.
CPC ...
34082532 ; 340540 ; 307 102 ; 342118 ;
Abstract
A keyless lock system for a vehicle includes a card for transmitting a radio signal, at least one onboard antenna for receiving the radio signal, and a control unit for allowing and preventing keyless lock and unlock operations in dependence on the existence or nonexistence of the card in a predetermined area near the antenna. The control unit monitors the position of of at least one monitored door, and produces a card warning signal each time the monitored door is closed if the card is absent in the vehicle.