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. 17, 2009
Filed:
Mar. 28, 2007
Hughes Sanoner, Discovery Bay, HK;
Desmond Wai Nang Tse, Tsuen Wan, HK;
Lawrence Chi Hang Chan, Yuen Long, HK;
Hughes Sanoner, Discovery Bay, HK;
Desmond Wai Nang Tse, Tsuen Wan, HK;
Lawrence Chi Hang Chan, Yuen Long, HK;
Solar Wide Industrial Limited, Tsuen Wan, New Territories, HK;
Abstract
A sensing device having a sensing surface for placing against a wall for detecting objects behind a wall lining has first and second sensors, each sensor including at least first and second capacitor plates and associated resistors forming RC circuits having time constants dependent on the adjacent wall material. Detection circuits connected to the RC circuits provide first and second voltage signals having amplitudes dependent on capacitance changes. A processor effects a comparison of the first and second voltage signals, and compares them to establish the magnitude of the voltage difference between the voltage signals, indicating a detected object center position when the difference signal is less than a predetermined value.