Liquid cleaning product
CA 2081599 C · Owner: Verburg, Charles Cornelis · Inventors: Verburg, Charles Cornelis; Houghton, Mark Phillip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A substantially non-aqueous liquid cleaning product composition comprises a non-aqueous organic solvent a, deflocculant and particles of solid material dispersed in the solvent, wherein from 25 to 75 % by weight of the solid material has a D(3,2) average particle diameter of less than 10 µm and from 75 to 25 % by weight of the solid material has a D(3,2) average particle diameter of more than 10 µm and the D(3,2) average particle size of the solid material is more than 10 µm.
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 28, 1992 and granted January 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 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.
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.