Moling system
CA 1332832 C · Owner: Ward, Peter · Inventors: Dickinson, Alan John; Ward, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A percussive-action mole (10) is energised by compressed air supplied through hollow rods (36) in a string (12) connected to the mole. A hydraulic motor (18) rotates the string and mole. The mole head (30) has a slant face (32) and a transverse permanent magnet (34). After each new rod is added to the string, the air supply to the mole is stopped to halt the mole which continues to be rotated. The field fluctuations from the magnet are detected by a magnetometer (24) using its probe at three positions (50), (52), (54) determined by a triangular frame (22) placed flat on the ground. Calculations using the three readings each representing the distance of the magnet from the respective …
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 November 1, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 1, 2011.
- 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.