Interactive video system
CA 2479607 A1 · Owner: Ormston, Christopher Stephen · Inventors: Hardwick, Andrew John; Payne, Roger Alyn; Brown, Peter John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for an interactive video system comprising a transmissive projection screen (8) from which an image projected on to the rear surface is visible from the front side but not visible from the rear side a projector (20) to , project display images on to the rear surface of the screen (8); and a video camera (22) positioned to video a user (2) in front of the screen (8). The user (2) effects a writing action on the screen (8) using a dry pen (24) comprising infrared LEDs (64) which operate when the dry pen (24) is pressed against the screen (8). These emissions are detected and position decoded and , a corresponding image projected on the screen (8) so it appears as direct …
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 March 11, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 11, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 2025.
- 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.