Magnetic shield
CA 2039683 A1 · Owner: Kosuge, Shigeyoshi · Inventors: Kosuge, Shigeyoshi; Shimbo, Yukio; Kabasawa, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A magnetic shield which comprises: a substrate; an intermediate layer of silver formed on at least one surface of the substrate; and a film of a composite oxide superconducting material containing a CuxOy-radical formed on the surface of the intermediate layer. The substrate is selected from the group consisting of a paramagnetic metal, a diamagnetic metal and ceramics and, the intermediate layer of silver has a thickness of from 20 to 200 µm. This magnetic shield has a high strength and a high magnetic shielding effect and can be manufactured at a low cost.
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 April 3, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 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.