Method and apparatus for discharging effluent from a photographic process
CA 2330198 A1 · Owner: Mcdonell, Michael · Inventors: Mcdonell, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
13-, An apparatus for discharging effluent from a photographic process such, as developing liquid to a drain. The effluent can be for example, de-, silvered, spent fixer liquid and spent developer liquid, which if mixed together particularly in the presence of oxygen form a solid iron oxide precipitate , which becomes a sludge and eventually clogs pipes and drains. The apparatus includes two separate reservoirs for holding the liquids and two separate pumps for pumping the liquids to a drain while minimizing the risk of , clogging in the pipes and drain from precipitate formation.
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 January 3, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 3, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 2023.
- 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.