Cleaning compositions
CA 2034488 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Oguni, Takayuki; Kabuki, Kimiaki; Saitoh, Nobuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cleaning composition comprising at least one low molecular weight polyorganosiloxane selected from the group consisting of straight chain polydiorganosiloxane represented by a general formula:, ... ... ... (I), (wherein R1 is an organic group of single valence substituted by the same or different group or unsubstituted and 1 is an integer, from 0 to 5), and cyclic polydiorganosiloxane represented by a general formula:, ... ... ... (II), (wherein R1 is an organic group of single valence substituted by the same or different group or unsubstituted and m is an integer, from 3 to 7). To use it as a water system cleaning agent polyoxyalkylene group containing polyorganosiloxane a, surfactant, …
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 25, 1990 and granted January 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 2012.
- 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.