Method for the preparation of halide glass articles
CA 2086540 C · Owner: France, Paul William · Inventors: France, Paul William; Williams, John Richard; Carter, Steven Fitzgerald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Halide glass articles, e.g.rods, tubes and preforms for making fluoride glass fibres are prepared by melting and/or casting the articles under a low pressure, e.g. 0.01 to 500 mbars and during the low pressure regime, a gas flow rate of between 0.01 to 100 litres/min (measured at NTP) is maintained. It has been found that subjecting the melts to a low pressure reduces the attenuation of the fibre which eventually results from the melts.
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 July 9, 1991 and granted July 29, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2013.
- 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.