Tape system with optically contrasting data marks
CA 1188790 A · Owner: Newell Research Corporation · Inventors: Pfost, R. Fred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a tape reading system wherein the tape in a tape cassette has color marks on the tape to be read by an optical system part of which is in the cassette and another part of which is in the tape drive. The part in the cassette consists of an optical element having mutually isolated light transmission paths. The paths carry light reflected from or transmitted through different portions of the width of the magnetic tape. The light is directed to optical sensors which are part of the tape drive. A lamp also part, of the drive, illuminates the tape so that light shining on the tape will contrast with the color marks. Changes in contrast due to the color marks trans-, …
Read the whole patent
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 11, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 11, 2002.
- 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.