Heat sink
CA 2117271 C · Owner: Villaume, Henry F. · Inventors: Villaume, Henry F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat sink (10) comprising a thin plate (20) made of a heat conducting material which plate includes a series of small tapered chimneys (30) extending therethrough, the plate being adapted to fit over and parallel to an entire circuit board (40) thermally, connecting with the semiconductors (50) on the board the chimneys being spaced inbetween the semiconductor and facilitating natural or forced airflow from the area between the plate and the printed circuit board to the area outside by means of the low pressure drop created by their tapering the heat sink taking very little vertical space in the electronics package including the printed circuit board while providing effective heat …
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 24, 1993 and granted October 13, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2015.
- 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.