Expired Canadian patentCanada
Polyaspartic acid as a calcium carbonate and a calcium phosphate inhibitor
CA 2083405 C · Owner: Meah, Abdul R. Y. · Inventors: Low, Kim C.; Koskan, Larry P.; Meah, Abdul R. Y.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
beta.-Polyaspartic acid having a weight average molecular weight of 1000 to 5000 produced by hydrolysis of anhydropolyaspartic acid, exhibits; a high degree of calcium carbonate and calcium phosphate inhibition.
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 March 19, 1992 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 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.
FiledMarch 19, 1992
GrantedAugust 20, 2002
Term endedMarch 19, 2012
Patent numberCA 2083405 C
Classification (IPC)C02F5/12 +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.