Information retrieval system having ramp motor control
CA 1087316 A · Owner: Bell & Howell Company · Inventors: Flint, John R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosure relates to a scanning means for use in an information retrieval system for locating a preselected information bearing element out of a plurality of information bearing elements which are consecutively numbered for identification. The scanning means includes a ramp generator which generates n ramp voltage drive, means for driving the information bearing elements in first and second directions at a rate substantially proportional to the magnitude of the ramp voltage sensing means for sensing the elements as they are driven, means for causing the drive means to drive the information bearing elements in the first or second direction towards the selected element means for …
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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 October 7, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 7, 1997.
- 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.