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. 06, 2001
Filed:
Nov. 12, 1999
Applicant:
Inventors:
Hiroyuki Kani, Nishio, JP;
Fumio Asakura, Okazaki, JP;
Tadashi Nakamura, Hoi-gun, JP;
Toru Yoshida, Kariya, JP;
Takeo Tsuzuki, Toyota, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B60R 2/510 ;
U.S. Cl.
CPC ...
B60R 2/510 ;
Abstract
In an entering detecting system for vehicles, a received ultrasonic signal is amplified by an amplifier circuit so that a Doppler signal may be generated from an amplified signal and a transmission signal for detecting an entering of unauthorized person into a vehicle compartment. An operational amplifier circuit of the amplifier circuit has an output limiter circuit. The output limiter circuit has diode series circuits which are connected to a feedback resistor of an operational amplifier.