Video communication system allowing graphic additions to the images communicated
CA 1163707 A · Owner: Rabeisen, Andre J.N. · Inventors: Rabeisen, Andre J.N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a video communication system which permits images obtained from video equipment such as a projector to be modified graphically as the images are being projected. The images are projected onto the lower surface of a screen through a dichroic crystal mirror. The screen is semi-transparent which permits the operator viewing the screen from above to view the images while preventing the operator's hand or writing instrument from being viewed from below. Various types of screen are disclosed but all are capable of permitting graphic information added to the upper surface of the screen by the operator to appear on the lower surface. For example the, screen may comprise a …
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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 March 13, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 13, 2001.
- 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.