Expired Canadian patentCanada
Liquid laundry detergents containing polyamino acid and polyalkylene glycol
CA 2177681 C · Owner: Panandiker, Rajan Keshav · Inventors: Zhen, Yueqian; Panandiker, Rajan Keshav
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Liquid laundry detergents containing an improved biodegradable clay soil removal/anti-deposition agent which is mixture of a polyamino acid (or a salt thereof) and polyalkylene glycol.
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 December 12, 1994 and granted October 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2016.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 12, 1994
GrantedOctober 19, 1999
Term endedDecember 12, 2014
Patent numberCA 2177681 C
Classification (IPC)C11D3/16 +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.