Dry cleaning methods and compositions
CA 2301636 A1 · Owner: Mcclain, James B. · Inventors: Romack, Timothy J.; Cauble, David F.; Mcclain, James B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for dry-cleaning articles such as fabrics and clothing in carbon dioxide comprises contacting an article to be cleaned with a liquid dry cleaning composition for a time sufficient to clean the fabric. The liquid drycleaning composition comprises a mixture of carbon dioxide water, a , surfactant, and an organic co-solvent. After the contacting step the article , is separated from the liquid dry cleaning composition. The method is preferably carried out at ambient temperature. The surfactant is preferably one that does not contain a CO2-philic group. The organic co-solvent is preferably an alkane and has a flash point above 140 ~F.
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 August 27, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 27, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2020.
- 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.