Bubble memory bias field structure
CA 1163713 A · Owner: Control Data Corporation · Inventors: Jallen, Gale A.; Bonnie, Gene P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a bias magnet for a bubble memory device comprised of a single material low permeability magnet contoured to enhance the magnetic field in the central area of the magnet and adapted to be slightly larger than the bubble memory chip and in thermal contact therewith. The entire bubble memory chip and bias magnet structure is to be surrounded by the rotating magnetic field drive coil structure.
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 March 13, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 13, 2001.
- 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.