Incandescent lamp having a vessel with an annular reflective coating and a filament arranged zigsagwise
CA 1265840 C · Owner: Huijbers, Antonius J. · Inventors: Huijbers, Antonius J.; Ingeveld, Johannes W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The electric incandescent lamp according to the invention has an annular mirror coating (10) on a hemispherical part (7) of its lamp vessel (1) and a filament (5) arranged zigzagwise between supporting points (12,13) which are located on the surface of an imaginary cone (14). The filament (5) is situated outside the part of the lamp vessel provided with the mirror coating (10). The lamp is particularly suitable for use as a traffic signal lamp and produces together with an external paraboloidal reflector a light beam of high luminous intensity at the centre and in directions enclosing a small angle with the axis of the beam, as a result of which the lamp may be designed for a comparatively …
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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 February 13, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 13, 2007.
- 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.