Base material for optical communication device and optical communication device
CA 2453666 A1 · Owner: Uehara, Hitoshi · Inventors: Sakamoto, Akihiko; Matano, Takahiro; Uehara, Hitoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A base material for an optical communication device which comprises a ceramic or glass ceramic having a minus thermal expansion coefficient of (-10 to -120) X 10-7/~C in a temperature range of -40 to 100~C characterized in that it has , been treated with a solution containing one or more organic silicon compounds selected from the group consisting of a siloxane compound and a silazane compound.
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 2, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 2, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 2, 2024.
- 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.