Expired Canadian patentCanada
Dredge for excavating holes or channels in a water bed
CA 1137122 A · Owner: Hollands Aannemersbedrijf Zanen Verstoep N.V. · Inventors: Van Tuijl, Cornelis W.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A self-sustaining excavator crab for operations particularly on a deep sea bottom, comprising a mobile truss dome carrying a vertically and radially adjustable drill or cutter.
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 December 7, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 7, 1999.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 27, 1980
GrantedDecember 7, 1982
Term endedDecember 7, 1999
Patent numberCA 1137122 A
Classification (IPC)E02F3/90 +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.