Optical waveguide and method and compositions for producing same
CA 1193620 A · Owner: Litovitz, Theodore A. · Inventors: Macedo, Pedro B.; Litovitz, Theodore A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a glass composition for forming glass articles suitable for forming or being converted to articles or devices for use in the guided transmission of light, for both imaging and communications purposes. Base glass compositions are purified by phase separation leached to remove, impurities, and dopants are then deposited into interconnected pores of porous glass in such a fashion that properties of the glass are varied, e.g. for optical purposes the index of re-, fraction is controlled.
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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
- Granted September 17, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2002.
- 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.