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. 12, 2012
Filed:
Feb. 12, 2009
Applicants:
Leslie Kendall Green, Applegate, CA (US);
James Helland, Agoura Hills, CA (US);
Xiaodong Wu, Roseville, CA (US);
Inventors:
Leslie Kendall Green, Applegate, CA (US);
James Helland, Agoura Hills, CA (US);
XiaoDong Wu, Roseville, CA (US);
Assignee:
Honeywell International Inc., Morristown, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B 13/00 (2006.01); G08B 13/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method and apparatus are provided for detecting an intruder. The method includes the steps of receiving an echo from opposing sides of a curtain line extending through the secure area, determining a difference between the received echoes, determining a phase difference of the signal and generating an alarm when the determined phase changes sign between successively received echoes.