Detection of instantaneous speed variations in a tape drive
CA 1235481 A · Owner: International Business Machines Corporation · Inventors: Yeary, David A.; Blanco, Alfred W.; Mcdowell, Judson A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
With high density reel-to-reel tape drives slight perturb-, tions in the tape path can cause instantaneous speed variations in the tape which can alter the recording density of data on the tape over a very short interval. This condition can be detected by measuring changes in recording intervals on a plurality of data tracks. Whenever all of the tracks indicate an unacceptable change in the recording interval an unacceptable speed variation has been encountered.
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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 April 19, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 19, 2005.
- 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.