Process for the fabrication of a spirally wound membrane module
CA 2034706 A1 · Owner: Shell Canada Limited · Inventors: Den Boestert, Johannes L. W. C.; Last, Thijme
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of manufacturing a spirally wound membrane module. A conventional method consists of wrapping the membrane envelope (with the feed and permeate spacers) around a permeate tube. The sealing of the envelope is achieved by applying a suitable adhesive on the formeate tube and around the edges of the membrane envelope before being rolled to form a spirally wound module. The present method avoids the application of the adhesive before rolling the module. In fact the module manufacture is the same except that no adhesive is applied and the module is rolled as before. The sealing of the module is achieved by "potting" the two ends of the rolled module. The feed spacer is kept free of …
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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 January 22, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2013.
- 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.