Technique for inverting the state of a plasma or similar display cell
CA 1070872 A · Owner: Western Electric Company, Incorporated · Inventors: Ngo, Peter D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure The state of a plasma or similar display cell is inverted by a two-pulse sequence comprising an inverting write pulse followed by an inverting erase pulse. The inverting write pulse switches a cell ON if it was OFF, while the inverting erase pulse switches the cell OFF if it was ON. The inverting write pulse is adapted to cause a gradual, rather than an immediate wall voltage build-up so that the inverting erase pulse is of insufficient magnitude to turn a cell OFF if it was turned on by the inverting write pulse. - i -
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 January 29, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 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.