Spiral wound element for separations
CA 2097632 C · Owner: Smith, Dean Leroy, Jr. · Inventors: Feimer, Joseph Louis; Smith, Dean Leroy, Jr.; De La Cruz, Deborah
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved spiral wound element for separations is disclosed wherein the improvement comprises using as the feed/retentate space one or more layers of a material having an open cross-sectional area in the range 30 to 70% and as the permeate spacer material at least three layers of material two of which are fine and have an open cross-sectional area of about 10 to 50% surrounding a coarse layer having an open cross-sectional area of about 50 to 90%. Elements of this configuration exhibit element separation performance nearly equivalent to that obtained using only the membrane. Such elements are useful in reverse osmosis ultrafiltration, pervaporation and other separation processes in which …
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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
- Filed June 3, 1993 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 3, 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.