Mixtures of volatile linear siloxanes
CA 2280465 C · Owner: Wacker-Chemie Gmbh · Inventors: Kohler, Thomas; Berthiaume, Marianne D.; Koini, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to mixtures of linear organosiloxanes of the general formula 1, R3Si0-(SiR2O)n-SiR3 (1), where R can be identical or different and is a hydrocarbon radical having from 1 to 18 carbon atoms which is optionally substituted by fluorine chlorine or, cyano radicals and is free from ethylenically or acetylenically unsaturated bonds, and, n has values from 0 to 20, where the mean number of carbon atoms of the radicals R is at most 3 and where the mixtures have evaporated, measured in accordance with DIN 53249 to an extent of from 80 to 95 % by weight after 30 minutes to an extent of from 90 to 99 % by weight after 60 minutes and to an extent of from 95 to 100% by weight after …
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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 August 17, 1999 and granted November 4, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 17, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 2021.
- 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.