Optical displays
CA 1106479 A · Owner: Siemens Aktiengesellschaft · Inventors: Schauer, Alois; Greubel, Waldemar; Kruger, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is an arrangement for representing images comprising a light valve, in particular a liquid crystal cell and a fluorescent body, made from a material having a refractive index greater than 1 which contains fluorescent particles and has in switchable zones of the medium coordinated, light outlet windows. A drive circuit is provided for switching the light valve. The light vale in its state of rest permits at least the passage of light for exciting the fluorescent particles as well as the light emitted by these particles (fluorescent light). The light valve in its switched-on state is impermeable to the fluorescent light and the drive circuit is arranged so that in the operative …
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 August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
- 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.