Fluorescent lamp with an integral fail-safe and auxiliary-amalgam component
CA 1063150 A · Owner: Westinghouse Electric Corporation · Inventors: Evans, George S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fast "warm-up" of an amalgam-regulated fluorescent lamp under "cold" starting conditions and safe failure of the lamp at the end of its useful life are achieved by coating selected portions of both stems with a material that contains indium or an indium alloy and initially is semiconductive. The coating is applied to portions of the stems adjacent the electrodes and covers a segment of one or both of the lead wires at the point where they emerge from the stem presses. The coating is thus rapidly heated and releases mercury vapor as soon as the lamp is energized. When the electrodes are devoid of emission material and the lamp has reached the end of its useful life, sputtered material from …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 25, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 25, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.