Method of treating fibrous materials
CA 2035284 C · Owner: Cray, Stephen Edward · Inventors: Cray, Stephen Edward; Renauld, Franck Andre Daniel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of treating fibrous materials comprises applying a polydiorganosiloxane having at least one unit (a) of the general formula, and at least one unit (b) of the general formula , wherein R is a hydroxyl monovalent, hydrocarbon or hydrocarbonoxy group R' is a divalent hydrocarbon, group which optionally contains oxygen and/or nitrogen R" is a hydrogen atom or an alkyl group optionally containing an oxygen atom in the form of a hydroxyl group and/or a C=O group a is 1 or 2, b 2 or 3 and each n from 2 to 8. Treated fibrous materials have improved softness with improved non-yellowing characteristics.
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 January 30, 1991 and granted December 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2013.
- 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.