Expired Canadian patentCanada
Surface corrosion protection detergent compositions containing polyvalent metal compounds and high levels of low foaming, nonionic surfactants
CA 2581809 C · Owner: Song, Brian Xiaoqing · Inventors: Song, Brian Xiaoqing
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Automatic dishwashing detergent compositions and compositions of matter having polyvalent metal compounds and high levels of low-foaming nonionic , surfactants, are provided for protecting glassware from corrosion.
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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 September 26, 2005 and granted November 26, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 26, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 26, 2005
GrantedNovember 26, 2013
Term endedSeptember 26, 2025
Patent numberCA 2581809 C
Classification (IPC)C11D3/00 +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.