Shock absorbing rotary drive coupling
CA 1060880 A · Owner: Bj-Hughes Inc. · Inventors: Work, John T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shock absorbing rotary drive coupling unit for drivingly connecting a tubular drive shaft to an axially aligned tubular driven shaft of a rotary blast hole drill. The unit has an annular body of resilient elastomer sandwiched between and bonded to end plates with lugs and fasteners for connecting the end plates respectively, to the drive shaft and the driven shaft.
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 August 21, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 21, 1996.
- 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.