Sonor controlled two focal position lens system
CA 1112497 A · Owner: Polaroid Corporation · Inventors: Johnson, Bruce K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A photographic camera in which a two-position lens is focused automatically on subjects located within "near" and "far" distance ranges from the camera. The lens is normally positioned in one of the two positions and movable to the other of the two positions in response to a signal generated by an electronic ranging circuit upon the detection of subject location in the focus range to which the other position corresponds.
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 November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 1998.
- 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.