Lasers and photo-detectors
CA 1076237 A · Owner: Post Office (The) · Inventors: Newman, David H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semi-conductor light source comprising a single piece of semi-conductor material having formed therein a semi-conductor laser and a semi-conductor optical detector. The semi-conductor laser having a first optical output port, a second optical output port and a resonant, cavity arranged so that in use light is emitted simultaneously through the first and second optical output ports. The semi-conductor laser also includes a pair of reflecting surfaces at right angles to one another which couple an optical output from said first optical output port into said detector.
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
- Granted April 22, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 22, 1997.
- 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.