Process for the improvement of the adhesion of photographic layers to a film web by means of a corona treatment
CA 1052728 A · Owner: Agfa-Gevaert Aktiengesellchaft · Inventors: Hoyer, Herbert; Muller-Bardorff, Wolfgang; Luttgens, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Corona treatment involves the continuous subjection of the film web to a steady alternating current discharge This treatment is carried out in two consecutive stages the corona discharge frequency f1 in the first stage being in the range f1 = 5 to 100 kHz and the corona discharge frequency f2 in the second stage being in the range f2 = 500 to 2000 kHz.
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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 April 17, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 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
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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.