Drycleaning detergent solution
CA 1066984 A · Owner: The Dow Chemical Company · Inventors: Deshon, Harold D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The detergent action and antiredeposition properties of a drycleaning solvent containing an anionic detergent, especially a petroleum sulfonate are improved, by the addition of a small amount of a polyglycol having an average molecular weight of 10,000 to 100,000 pre-, ferably 12,000-60,000, and prepared from ethylene and propylene oxides. The invention is especially adapted to lower aliphatic hydrocarbons, such as carbon tetrachloride, perchloroethylene and trichloroethylene.
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
- Granted November 27, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 27, 1996.
- 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.