High speed thermomagnetic tape duplication
CA 1311556 C · Owner: E.I. Du Pont De Nemours And Company · Inventors: Gantzhorn, John Edwin, Jr.; Uhler, Roger Oscar; Mccloud, John Wesley, Ii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and equipment is disclosed that is capable of duplicating magnetic tapes at speeds higher than 2.5 meters/second. Tape surfaces are selected that have sufficient roughness to leadily permit air to bleed from between surfaces as they are held together by air pressure during the duplication process.
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 December 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 2009.
- 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.