Alumina coatings for mercury vapor lamps
CA 1060942 A · Owner: General Electric Company · Inventors: Maloney, Kenneth M.; Clark, Robert E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved mercury vapor lamp construction has an ultraviolet-reflecting layer of alumina particles under a phosphor coating to enable reduction of the phosphor coating weight without an accompanying reduction in lamp lumen output. The alumina underlayer comprises spherical alumina particles that have been vapor-deposited in a certain particle size range to provide selective reflection of the ultraviolet radiation being emitted from the overlying phosphor coating. The alumina underlayer is deposited upon the interior surface of the lamp glass envelope and deposited upon the interior surface of the lamp conventional high-pressure and low-pressure mercury vapor lamps.
Read the whole patent
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 August 21, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 21, 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.