An indirect luminaire having a secondary source induced low brightness lens element
CA 2001111 C · Owner: Herst, Douglas J. · Inventors: Herst, Douglas J.; Ngai, Peter Y. Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An indirect lighting system having a generally visible light transmissive element, such as a prismatic lens element (31 33) or, a diffuser strip, which modifies the direction of the light incident thereon from a secondary light source The lighting, system has a primary light source (13 14) and structural means as, in a housing (21) for positioning the primary light source proximate a reflective surface (12) which reflects light back toward the light transmissive element and which thereby acts as a secondary source of light for illuminating this element. A light foil means such as vertical side reflector walls (45 47) are, disposed between the primary light source and light transmissive …
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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
- Filed October 20, 1989 and granted February 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 20, 2011.
- 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.