Optical coupler using low or zero birefringence optical fibers
CA 1288267 C · Owner: Stc Limited · Inventors: Bricheno, Terry; Baker, Vernon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure Polarisation beam splitters/combiners or polarisation insensitive beam splitters/combiners are manufactured from low or zero birefringence single mode optical fibre, rather than high birefringence fibre by, using a differential pulling technique to induce the appropriate amount of form birefringence the fibres, being stretched further than hitherto.
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
- Granted September 3, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 3, 2008.
- 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.