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:
May. 21, 2013
Filed:
May. 06, 2004
Andrew M Scott, Malvern Worcs, GB;
Keith L Lewis, Malvern Worcs, GB;
Mark E Mcnie, Malvern Worcs, GB;
Kevin M Brunson, Malvern Worcs, GB;
David J Jackson, Malvern Worcs, GB;
Kevin D Ridley, Malvern Worcs, GB;
Andrew M Scott, Malvern Worcs, GB;
Keith L Lewis, Malvern Worcs, GB;
Mark E McNie, Malvern Worcs, GB;
Kevin M Brunson, Malvern Worcs, GB;
David J Jackson, Malvern Worcs, GB;
Kevin D Ridley, Malvern Worcs, GB;
Qinetiq Limited, Famborough, Hants, GB;
Abstract
A retro-reflective identification tag capable of modulating an optical signal whereby to support bi-directional communication with an associated remote optical interrogation device. The tag comprises a MOEMS modulating layer over a retro-reflective substrate, giving the tag a wide angle of effective operation. The tag modulator may optionally be switched on only responsive to detection of a precursor beam from the interrogation system in order to save power. The interrogation device may make use of multiple optical wavelengths for communicating with the tag.