Light emitting diode array
CA 2015358 C · Owner: Tsuda, Shigeo · Inventors: Tsuda, Shigeo; Nishioka, Takafumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an LED array an opaque layer is provided, on a semiconductor body having PN junctions. Through holes having a relatively small, diameter, are formed in the opaque layer on the PN junctions. Light which is generated at the PN junctions is emitted only through the holes in the form of photobeams. The LED array can be used in an electronic printer for photography without a self-focus lens array. -17-
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 25, 1990 and granted August 23, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 25, 2012.
- 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.