Uniform intensity profile catadioptric lens
CA 2049504 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Nelson, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a light fixture having a catadioptric lens designed to discard preselected amounts of light from a light source. The percentage of the light discarded will vary over the surface of the reflector in order to provide a predetermined output intensity distribution. SWBAPP1(45839F0R.ABS)
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 August 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 19, 2013.
- 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.