Faraday rotator
CA 2131124 A1 · Owner: Takeda, Norio · Inventors: Shirai, Kazushi; Takeda, Norio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a means of erasing the magnetic hysteresis with respect to a rare-earth iron garnet single-crystal film with large magnetic hysteresis which is an obstacle in using as a Faraday rotator although the film has extremely small saturated magnetic field intensity. In the present invention a permanent magnet is posi-, tioned on a part of a rare-earth iron garnet single crystal. According to the present invention the magnetic hystere-, sis can be erased with respect to a rare-earth iron garnet single-crystal film with large magnetic hysteresis which is an obstacle in using as a Faraday rotator although the film has extremely small saturated magnetic field intensity. …
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 August 30, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 30, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 2016.
- 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.