Flame retardant polymer composition containing phosphonic acid salts
CA 1308510 C · Owner: Ciba-Geigy Ag · Inventors: Richardson, Norman, (Deceased); Dellar, Richard J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Flame Retardant Polymer Composition Containing Phosponic Acid Salts, The invention provides a composition comprising a halogen-free polymer and as flame retardant at least a metal or metalloid salt of a phosphonic acid of the general formula I: (I), in which R is a straight or branched chain alkyl group having 1 to 3 carbon atoms optionally substituted by one or more of halogen atoms or hydroxyl groups; and R' is hydrogen or an alkyl group having 1 to 3 carbon atoms, and wherein the metal or metalloid is selected from Groups IIA, IIB, IIIA, IVA and VA of the Period Chart of Elements.
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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
- Granted October 6, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 6, 2009.
- 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.