Canadian application, no grantCanada
High temperature filter
CA 2001192 A1 · Owner: Norton Company · Inventors: Butkus, Anthony K.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Filter for hot gases comprising a mass of, grains formed of a ceramic having a high melting temperature and bonded together at contact point by molten power of the same ceramic.
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 October 23, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 23, 1989
GrantedNo grant recorded
Term endedOctober 23, 2009
Patent numberCA 2001192 A1
Classification (IPC)B01D39/20 +2 more
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.