Expired Canadian patentCanada
Improved rinse aid compositions containing phosphate esters
CA 2216004 C · Owner: Roberts, Glenis · Inventors: Roberts, Glenis; Zack, Kenneth L.; Welch, Michael C.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to rinse aid compositions comprising non-ionic surfactants, acrylic acid polymers and phosphate esters.
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 9, 1997 and granted May 15, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 9, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 9, 2019.
- 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 9, 1997
GrantedMay 15, 2001
Term endedOctober 9, 2017
Patent numberCA 2216004 C
Classification (IPC)C11D1/66 +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.