Synthetic filter media and method for manufacturing same
CA 2224857 C · Owner: The Racal Corporation Canada Inc./La Societe Racal Canada Inc. · Inventors: Legare, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite filter media (100) includes a meltblown fiber material and a nonwoven filter web which are preferably attached to each other by needling the nonwoven filter web with the meltblown fiber material. A netting (104) is then attached by preferably needling the nonwoven filter web and meltblown through the netting (104).
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 April 29, 1997 and granted December 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2019.
- 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.