Flexible sheet material
CA 1204255 A · Owner: T&N Materials Research Limited · Inventors: Hargreaves, Brian; Lancaster, Robert A.; Crabtree, John D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Non-asbestos flexible sheet material suitable for use in gaskets for the exhaust manifold of an internal combustion engine is made by dewatering on a water-permeable conveyor a layer of aqueous slurry and compressing and drying the dewatered layer the aqueous, slurry employed being one that contains the following ingredients in the following proportions by dry weight: ball clay 25-44, non-fibrous layer silicate 25-40% graphite 10-30%, cellulose fibres 3-15% synthetic rubber 1-10%, starch 1-5%
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 May 13, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 13, 2003.
- 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.