Tapered, spirally wound filter cartridge and method of making same
CA 1320143 C · Owner: Paulson, David J. · Inventors: Paulson, David J.; Bertelsen, Robert A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spirally wound filter cartridge for use in a filtration device having a filter cartridge housing with a tapered side wall. The filter cartridge includes a sheet of filtration material spirally wound around a central permeate tube and includes first and second ends which are different in diametrical dimension resulting in the outer surface of the filter cartridge being tapered from one end to the other. The invention also relates to a method of making the above filter cartridge with tapered sides.
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
- Granted July 13, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 13, 2010.
- 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.