Magnetic sheet with repeated curved magnetic areas
CA 2113356 C · Owner: Nikken, Inc. · Inventors: Johnson, Alexander C. Jr.; Mitsuno, Hiroyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flexible planar magnetic sheet (10) for therapeutic use has a regular repeating pattern of curved first and second areas (82 and 84) of alternating magnetic polarity arranged so that a line traverses a plurality of said curved areas in a majority of possible orientations of the line along the surface plane of the sheet (10) with respect to the pattern. In one embodiment the pattern, comprises an array of polka dot regions (14) of one polarity uniformly sized and spaced on a background of opposite polarity. Alternatively the pattern can be shaped as a series of interdigitated undulating first and second areas (82 and 84) of alternating magnetic polarity. The areas (82 and 84) each …
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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
- Filed June 2, 1993 and granted August 14, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2015.
- 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.