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Expired Canadian patentCanada

Lighting system combining daylight concentrators and an artificial source

CA 1236808 A · Owner: Dhr, Incorporated · Inventors: Friedman, Peter S.; Bornstein, Jonathan G.

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A combined lighting system for a building interior includes a stack of luminescent solar concentrators (LSC) an optical conduit made of preferably optical fibers for transmitting daylight from the LSC stack a collimating, lens set at an angle, a fixture for receiving the daylight at one end and for distributing the daylight as illumination inside the building, an artificial light source at the other end of the fixture for directing artifical light into the fixture for distribution as illuinination inside the building an automatic dimmer/brightener for the artificial light source and a daylight sensor positioned near to the LSC stack for controlling the automatic dimmer/brightener in …

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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 May 17, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 17, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 28, 1985
GrantedMay 17, 1988
Term endedMay 17, 2005
Patent numberCA 1236808 A
Classification (IPC)F21V7/00 +2 more

Timeline

Timeline From CIPO dates

1986198819901992199419961998200020022004Application filedJune 28, 1985Patent grantedMay 17, 1988Term endedMay 17, 2005

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.