Thin film electroluminescent device
CA 1256972 A · Owner: N.V.Philips'Gloeilampenfabrieken · Inventors: Richard J.; Cammack, David A.; Walz, David G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PHA. 21.215 5, ABSTRACT:, A thin film DC operable electroluminescent device of increased life and improved properties is disclosed. The device employs a thin film of a manganese activated zinc sulfoselenide luminescent material and a layer of yttrium oxide positioned between the luminescent material and a reflective electrode.
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 July 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 4, 2006.
- 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.