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:
Feb. 01, 2005
Filed:
Jul. 02, 1999
Timothy Ashley, Malvern, GB;
John Graham Crowder, Edinburgh, GB;
Stanley D. Smith, Edinburgh, GB;
Volker P Manheim, Jever, DE;
Timothy Ashley, Malvern, GB;
John Graham Crowder, Edinburgh, GB;
Stanley D. Smith, Edinburgh, GB;
Volker P Manheim, Jever, DE;
QinetiQ Limited, London, GB;
Abstract
An infrared light emitting diode arrangement comprising an infrared light emitting diode which emits positive luminescence when forward biased and emits negative luminescence when reverse biased. The diode is driven by an alternating forward and reverse bias input so that the difference in output power between the positive luminescence and the negative luminescence of the light emitting diode is stabilised with respect to temperature. The infrared light emitting diode arrangement has particular application as a source in gas sensors and reduces or eliminates temperature control requirements for infrared light emitting diode sources.