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. 19, 1990
Filed:
Oct. 11, 1988
Raul Curbelo, Lexington, MA (US);
David C Brown, Cambridge, MA (US);
Bio-Rad Laboratories, Inc., Hercules, CA (US);
Abstract
An infrared source that operates at about 1150.degree. C. without the need for water cooling. The source is configured with a small surface area radiating element, energized by a high frequency AC square wave. The frequency of the AC square wave is much greater than the inverse of the filament's thermal time constant so that the temperature is very stable. The radiating element is mounted relative to a concave reflector so that the infrared radiation forms a beam suitable for input to a spectrometer. In a first embodiment, the radiating element is in the form of a wire coil, while in a second embodiment, it is in the form of a cylinder having a central portion of reduced diameter.