Exposure control device for photographic copier
CA 1068146 A · Owner: Hoechst Aktiengesellschaft · Inventors: Pils, Walter; Sader, Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a control device suitable for use to, control the exposure of a light-sensitive material in a copying apparatus for the preparation of a printing plate which comprises program, store means for predetermining a basic exposure input line means for, connection to a photocell for measuring the luminous intensity of a light source in the copying apparatus, comparator means having its input connected to an output of the program store means and connected by a transmission path means to the input line means the output of the com-, parator means being connectable to a control switch for the light source and the transmission characteristics of the path being variable in …
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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 December 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 18, 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.