Distributed feedback laser for frequency modulation communication systems
CA 2006124 C · Owner: Tkach, Robert W. · Inventors: Chraplyvy, Andrew R.; Koch, Thomas L.; Tkach, Robert W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A quartz lamp envelope includes a press seal at, least one molybdenum foil feedthrough extending through the press seal to the lamp interior and an, external electrical lead connected to the molybdenum foil. The molybdenum foil has an, oxidation-inhibiting material such as chromium, aluminum and combinations thereof embedded in a, surface layer thereof by ion implantation. The electrical lead has an oxidation-inhibiting coating such as silicon carbide, silicon nitride and combinations thereof, formed by plasma-enhanced chemical vapor deposition. Alternatively the, electrical lead can have an oxidation-inhibiting material embedded in a surface layer thereof by ion implantation.
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 December 20, 1989 and granted October 12, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2011.
- 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.