Lens for video terminal screen
CA 1268064 C · Owner: American Optical Corporation · Inventors: Lummis, David John; Masso, Jon Dickinson
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and lens are disclosed for improving the visual comfort and perceived vision of a person viewing an image transmitted from a video display terminal. The use of a lens tint complementary to the image color on the terminal screen is employed to improve screen contrast and reduce fatigue.
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 April 25, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 25, 2007.
- 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.