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:
Oct. 27, 1987
Filed:
May. 26, 1982
Peter J Walsh, Stirling, NJ (US);
Duro-Test Corporation, North Bergen, NJ (US);
Abstract
An incandescent lamp has an envelope within which is enclosed an incandescent filament. The incandescent filament is surrounded by a tubular element with open ends. The element transmits visible radiation, and reduces but does not eliminate convection around the filament. This reduces the rate at which evaporated filament material is carried away from the filament and deposited elsewhere within the lamp. If desired, a filter coating may be placed on the element for reflecting infrared radiation back to the filament and transmitting visible radiation away from the filament and out of the lamp. The element may engage the filament leads for mounting purposes.