Smoke and toxic gas suppressant composition
CA 1328944 C · Owner: Bentley, Robert Leonard · Inventors: Bentley, Robert Leonard; Gainer, James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Smoke and Toxic Gas Suppressant Composition Abstract of Disclosure, The present invention provides a composition comprising a combustible material containing urethane linkages; and as a smoke and toxic gas suppressant, a polyester which has an acid value below 30 mg KOH/g preferably below 10 mg KOH/g, and which is derived from: Ia.A a component which contains 4 carboxyl groups or anhydride thereof and which is preferably an aromatic component or, Ib. a mixture of A and s:, B one or more components which contain 2 to 12 preferably 2 to 4, carboxyl groups or 1 to 6 preferably 1 or 2, carboxylic anhydride groups, selected from:, B1 an aliphatic carboxylic acid component containing 2-16 carbon …
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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 April 26, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 26, 2011.
- 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.