Expired Canadian patentCanada
Method of preventing grease buildup in ductwork
CA 2122998 C · Owner: Bober, Andrew Martin · Inventors: Bober, Andrew Martin; Kawa, John
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of protecting vent hoods and exhaust ductwork from buildup of grease and grime comprising coating the vent hoods and exhaust ductwork with a thin coating of a grease repelling removable non-hygroscopic composition.
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 November 5, 1992 and granted May 25, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 5, 2014.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 5, 1992
GrantedMay 25, 1999
Term endedNovember 5, 2012
Patent numberCA 2122998 C
Classification (IPC)B08B17/04 +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.