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. 12, 2013
Filed:
Nov. 16, 2011
Philip John Allen, Nottingham, GB;
Andrew John Gilbert, Kent, GB;
Philip John Allen, Nottingham, GB;
Andrew John Gilbert, Kent, GB;
Filtrona C&SP Limited, Nottingham, GB;
Abstract
Apparatus for detection of infrared radiation emitted from a taggant following excitation of the taggant sample measures the decay time of the radiation used. If the decay characteristic is accurately measured, the particular taggant can be accurately identified. The apparatus comprises an electronic controller, light-emitting diodes, a photo-detector, a first amplifier, a three-way sampling switch, filter/stores, second amplifiers and an output display. The infrared emission is excited by repeatedly illuminating the taggant for a period of microseconds every few milliseconds. When the light source is turned off, the sample continues radiating for a few milliseconds. The emission is detected by photo-detector sensitive to the 800 to 1000 nm waveband thereby rejecting interference from visible light sources.