Asbestos-free asphalt coatings
CA 1304200 C · Owner: Vicenzi, Stephen J. · Inventors: Vicenzi, Stephen J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
18-, Abstract of the Disclosure, An improved asphalt roof-coating composition of the asbestos-free type which include asphalt cutback clay, a, surfactant, and fillers. An alkyloxyalkylamine salt surfactant, preferably an alkyloxypropylamine salt having an alkyl chain with from 9 to 20 carbon atoms is utilized in substantially lower amounts than required of surfactants in previous compositions. Excellent stable gel structure and easier blending are provided.
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
- Granted June 30, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 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.