Optical device and method
CA 2025396 A1 · Owner: Corning Incorporated · Inventors: Smith, Dennis Wayne; Borrelli, Nicholas Francis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a method of forming optical devices composed of a photonucleable crystalliz-, able, lithium silicate glass body having at least one clear glass lens integral with and rising above at least one surface thereof, the lens being surrounded by a crystallized glass matrix, and optical devices produced by such method. The inventive method comprises subjecting the crystallized body to an ion exchange reaction wherein sodium and/or potassium ions from an external source are exchanged for lithium ions within the surface of the glass lens the, exchange reaction being conducted at a temperature of about 25°-125°C above the annealing point of the glass for a time sufficient …
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 September 14, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 14, 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.