Maintenance cleaning for membranes
CA 2279087 A1 · Owner: Rabie, Hamid · Inventors: Behmann, Henry; Husain, Hidayat; Rabie, Hamid
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Membranes immersed in water are cleaned by (a) stopping permeation, (b) flowing a chemical cleaner through the membranes in a direction opposite to the direction in which permeate passes through the membrane, and (c) resuming permeation, wherein chemical cleaner remains substantially undiluted in an area adjacent the membranes and no agitation is provided in this area. The chemical cleaner is preferably applied in pulses over a period of time. The total amount of chemical cleaner used however, is small. In an embodiment, the chemical cleaner is heated water. The cleaning events are repeated between twice per day and once a week to reduce the rate of loss of permeability in the membranes …
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 July 29, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 29, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 2021.
- 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.