Tube feeding device for use in charging shotholes with explosive through a pipe or tube
CA 1069358 A · Owner: Elizabeth Hurtibise, Marengere · Inventors: Sternhoff, Bror L.T.; Egerstrom, Begin G.W.T.Z.; Elizabeth Hurtibise, Marengere
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A tube feeding device for charging shotholes with explosive which includes a feed tube and two or more reciprocable gripping devices for advancing the feed tube. Each gripping device is arranged to grip the tube during its stroke in the desired direction of advancement and the reciprocating cycles of the different gripping devices are out of phase with one another so that whilst the tube is being advanced by one gripping device another is affecting a return stroke.
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.
Why it's free to use
- Granted January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- 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.