Mining equipment
CA 1111455 A · Owner: Mining Supplies Limited · Inventors: Needham, Raymond
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spiral vane shearer disc capable of manufacture by simpler techniques than those currently employed as an outer end of a drum, around the external periphery of which is welded a helical vane, provided at one end with a tyre the latter having, a plurality of preformed spaced apart, blind sockets, each, adapted to receive a pick box. This construction eases the welding operation whilst gives improved transmission of loading from the picks to the disc.
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 October 27, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 27, 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.
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.