Pressure actuated light pen
CA 1058783 A · Owner: Northern Telecom Limited · Inventors: Hillman, Garth D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pressure actuated light pen attached to the end of an optical fibre bundle has a retractable shutter mechanism at its forward end. The shutter mechanism comprises a plurality of wedge-shaped sections, resiliently urged in a forward direction to at least substantially close off light admittance, and moveable rearwards along inclined paths to produce an aperture at their forward ends the light pattern, at the aperture focussed on the ends of the fibres. - i -
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 July 17, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 17, 1996.
- 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.