Expired Canadian patentCanada
Friction material for railroad disc brakes
CA 1102033 A · Owner: Johns-Manville Corporation · Inventors: Reynolds, Harold J. Jr.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A railroad disc brake shoe composition is disclosed comprising, in parts by weight:, phenolic resin binder 25-35 parts carbonaceous component 2-12 parts, asbestos fiber 35-50 parts silicon carbide 0.4- 3 parts
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 26, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 9, 1977
GrantedMay 26, 1981
Term endedMay 26, 1998
Patent numberCA 1102033 A
Classification (IPC)C08K3/04 +2 more
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.