Absolute position detector
CA 1255371 A · Owner: Hitachi, Ltd. · Inventors: Takahashi, Tadashi; Kawamata, Syouichi; Miyashita, Kunio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract:, A magnetic recording medium is formed on a rotary drum and is divided into a plurality of magnetic tracks. On each tract there is recorded a magnetic signal of a combination of a magnetization portion which consists of two consecutive unit magnets (pitch .lambda.) and a no magnetization portion having the same length (2.lambda.) arranged to alternate over the whole periphery of the track. First magnetoresistive elements in the magnetic sensor are arranged in pairs opposite the magnetic tracks at a distance of .lambda./2. Second magnetoresistive elements opposite the magnetic track that corresponds to the lowest-order bit of the position detecting signals have a number of 2m …
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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 June 6, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 6, 2006.
- 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.