Recirculation, replenishment, refresh, recharge and backflush for a photographic processing apparatus
CA 2088971 C · Owner: Rosenburgh, John Howard · Inventors: Bartell, Roger Edwin; Patton, David Lynn; Piccinino, Ralph Leonard, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for processing photosensitive materials, which comprises: a tank through which a processing solution is pumped; a rack having integral means to facilitate its insertion and removal from the tank, the rack and the tank are relatively dimensioned so that a small volume for holding processing solution and photosensitive material is formed between the rack and the tank; means for filling the small volume and the circulating means, from the lowest elevation point of the small volume and the lowest elevation point of the circulating means, with processing solution to prevent air from being entrapped in the processing apparatus; and means for emptying the small volume and the …
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
- Filed February 5, 1993 and granted July 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2015.
- 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.