Exposure control system with follow focus capability
CA 1064751 A · Owner: Polaroid Corporation · Inventors: Whiteside, George D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved exposure control system featuring a follow-focus mechanism wherein the geometrical relationship of the mechanical components are determined in a select manner to provide uniform adjustment of the exposure aperture through a trim mechanism irrespective of the actual focus setting. The follow focus additionally may be precisely calibrated despite the cumulative effect attributable to the dimensional variations of the individual components albeit such variations remain within prescribed tolerances.
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 October 23, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 23, 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.