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. 10, 1998
Filed:
May. 26, 1995
Munisamy Anandan, Burlington, MA (US);
Jakob Maya, Brookline, MA (US);
Matsushita Electric R & D Laboratory, Woburn, MA (US);
Abstract
Manufacture of a substantially flat compact fluorescent lamp using a molded cup-like continuous concentric (spiralled) channel and a circular plate, resembling a lid for the cup. The cup with the channel is coated with a light reflective layer followed by a phosphor layer (whereas the lid, on one side, is coated with the phosphor layer only) and has two holes through which two electrodes are sealed such that one of the said holes has, in addition to the electrode, an integral exhaust tubulation. The space between the cup and the lid is filled with a material capable of emitting ultraviolet under electrical excitation. Electrical discharge created between the electrodes, strictly follows the path of the channel physically imposed by the sealed structure, in spite of a nonsealed contact of the top surface of the channel walls and the plane surface of the lid. On absorption of the ultra-violet from the discharge, the phosphor emits visible radiation.