Method and apparatus for reading or writing on tape using a servo positioned multiple channel head
CA 2006886 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Youngquist, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method for reading or writing data on a tape which has a plurality of data tracks and at least a first dedicated servo track. A multiple channel head with at least three channels, each having at least one element for reading or writing, is used to access the tracks on the tape. The head is moved proximate one of a plurality of predetermined positions. The channels are located so that in any one predetermined position of the head one channel, accesses the center of a dedicated servo track on the tape and at least two other channels will access the center of distinct data tracks. Depending on the predetermined position of the head, different channels will access a dedicated …
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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 December 29, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 29, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 29, 2011.
- 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.