Expired Canadian patentCanada
Abrasion resistant coatings for fertilizers
CA 2103903 C · Owner: The O. M. Scott & Sons Company · Inventors: Hudson, Alice P.; Woodward, Fred E.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mixtures of hydrocarbon waxes and hydrocarbon soluble polymers which have oxygen containing polar groups provide an abrasion resistant sealant coating for sulfur coated urea.
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 February 12, 1992 and granted August 13, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 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.
FiledFebruary 12, 1992
GrantedAugust 13, 2002
Term endedFebruary 12, 2012
Patent numberCA 2103903 C
Classification (IPC)C05G5/30 +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.