Light fixture with controllable light block
CA 2217872 C · Owner: Stone, Thomas A. · Inventors: Crookham, Joe P.; Disanto, Dorothy K.; Stone, Thomas A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lighting fixture (10) with a controllable light block (26). The fixture (10) includes a reflector (16) and high intensity discharge lamp (18) that requires a re-strike or warm-up period to come to full brightness or intensity. A cover member (26) is mounted to the reflector (16) and is moveable between an unblocked position and a blocked position. Movement of the cover member (26) is immediate so that blockage of light from the fixture is immediately effectuated. The apparatus is configured so that cover member (26) can be in the blocked position for indefinite periods of time even though the arc lamp continues to be operated at full power without heat buildup which is , …
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 April 17, 1996 and granted October 17, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2018.
- 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.