Camera which can regulate the exposure area of a frame of film
CA 1264591 C · Owner: Shyu, Shiow-Feng · Inventors: Shyu, Shiow-Feng
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A whole frame/half frame camera has a push bar extending outside the camera body to allow the activation of a regulating plate inside the camera body. When actuated the, plate moves in a fixed orbit to be positioned in one of two positions. In one position, the plate causes a view shield device to shield a portion of the view area on two sides of a viewfinder, and induces a pair of opaque movable blades to shield an exposure window also from two sides. In this position the plate also activates a clutch device for controlling a film advance wheel such that the wheel will rotate only a half cycle for each photograph taken so, reducing the length of film wound to one half of the length that is …
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 January 23, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 2007.
- 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.