Film deceleration unit
CA 2094915 C · Owner: Smith, Irvine W. · Inventors: Smith, Irvine W.; Shaw, William C.; Maxwell, Ian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A projector having a, rolling loop film transport mechanism is provided with, a film decelerating cam unit (52) that is located in adv-, ance of the aperture of the projector. Deceleration pins, (66) carried by a pair of vertically spaced arms (62) that, project from the cam unit en-, gage in upper and lower mar-, ginal perforations in the film and travel with the film tow-, ards the aperture and decelerate the film as each frame is, advanced. The cam unit includes two cams (56, 58), one, of which causes the decelerating motion of the pins, and a, return motion in the reverse direction, while the other cam, (58) causes the pins to advance and retract into and, from the film path …
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 August 12, 1991 and granted May 28, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 2013.
- 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.