Photographic film handling apparatus with circular vented film pressure plate
CA 1075950 A · Owner: Bell And Howell Company · Inventors: Jamieson, John; Price, Henry F.; Butts, William O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photographic film handling apparatus of the invention wherein photographic film is positioned at a structure defining an image aperture comprises a film pressure plate having a cluster of air holes for an escape of air from a space between the film pressure plate and adjacent photographic film equipment for mounting, the film pressure plate adjacent the aperture defining structure and equipment coupled to the film pressure plate for actuating the film pressure plate relative to the aperture defining structure. A camera including such film handling apparatus and for photographing information on microfilm comprises the said structure defining an image aperture, a lens system for projecting …
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 April 22, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 22, 1997.
- 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.