Process for the manufacture of proton-exchanged waveguides
CA 2289876 A1 · Owner: Geosling, Christine Ellen · Inventors: Gampp, Lorrie Lane; Abbink, Henry; Geosling, Christine Ellen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the manufacture of proton-exchanged waveguides for multifunction integrated optics chips ("MIOC's") includes the steps of (a) providing a wafer of a material such as lithium niobate; (b) affixing a removable mask to at least one surface of the wafer to form one or more proton-exchange patterns of desired size and shape on the surface of the wafer; (c) subjecting the unmasked portions of the masked wafer to a proton-exchange procedure for a period of time less than a predetermined maximum proton exchange time; (d) analyzing the masked wafer to determine if a specified parameter of the unmasked portions has achieved a first predetermined value; (e) repeating the proton exchange …
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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 November 17, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 17, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 2021.
- 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.