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:
Jun. 15, 1999
Filed:
Dec. 11, 1997
Chao-Ting Lin, Kao Hsiung, TW;
Sheng-Hsiung Lin, Ping Tung Hsien, TW;
Lite-On Automotive Corp., Kaohsiung, TW;
Abstract
A combined type intrusion and attack sensing device was a microwave oscillation and Doppler detect circuit an intrusion band-pass filter, an attack band-pass filter, two comparators, two alarm driving circuits, and a suspended object. The combined type intrusion and attack sensing device adopts the Doppler effect to sense an intrusion and employs a microwave antenna to transmit a signal in the microwave band within a predetermined range. The signal will be reflected by any object within above range or suspended object vibration, and the reflected wave will be received by the antenna. The reflected wave will be mixed with original signal to generate a difference-frequency signal. The difference-frequency signal is amplified by an intrusion band-pass filter or an attack band-pass filter. The amplified and filtered signal is sent to two comparator circuits for comparison with a reference signal to generate two driving signals to drive one of the two alarm-generating circuits. The driven alarm-generating circuit will raise an alarm to help prevent burglary.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile