Image rotation device
CA 2119123 C · Owner: Hulet, Randall G. · Inventors: Sudarshan, E. C. George; Hulet, Randall G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical rotation device (10) with infinite depth of field for transmitting optical images along an optical axis and selectively rotating the image (26) about the optical axis while preserving all of , the three dimensional characteristics of the image. The optical rotation device consists of two optical elements (12,14) optically coupled in series, each of which produces an inversion of the image about an axis orthogonal to the optical axis. Rotation of the image by any angle in the plane normal to the optical axis is achieved by rotating the two optical elements relative to one another about the optical axis.
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
- Filed October 6, 1992 and granted November 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2014.
- 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.