Optical communications
CA 1211641 A · Owner: Barr & Stroud Limited · Inventors: Hamilton, James G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical slip ring comprises a housing made of low refractive index material which defines a hollow toroid and a pair of passageways leading from the toroid . One passageway leaves the toroid steplessly in a clockwise direction and passageway leaves the toroid steplessly in an anti (counter-)clockwise direction. The toroid and the passageways are filled with high refractive index fluid. The housing is formed in two portions which are mounted for relative rotation about an axis perpendicular to the toroidal equatorial plane and coincident with the centre of the toroid, each portion having an interface lying on a surface of revolution (which may be the toroidal equatorial plane ) generated …
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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 23, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 2003.
- 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.