Incandescent illumination system
CA 2103358 A1 · Owner: Cunningham, David W. · Inventors: Cunningham, David W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved incandescent lamp is disclosed that is specially adapted for use in combination with a concave reflector (15) in providing a high-intensity beam of light. The lamp (13) includes a plurality of linear, helically-wound filaments (25a 25b, 25c, 25d) , arranged with their longitudinal axes parallel with each other and spaced substantially uniformly around the lamp's central longitudinal axis (29). Orienting such a lamp with its longitudinal axis aligned with the reflector's longitudinal axis and with the, filaments near the reflector's general focal point ensures that a , high proportion of the emitted light is collected by the reflector (15) to project the high-intensity beam.
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
- Filed July 2, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2014.
- 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.