Automatic control system for a concrete distributing pipe in tunnel lining
CA 2306956 A1 · Owner: Arpini, Roberto · Inventors: Arpini, Roberto; Moretti, Giorgio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
System for performing automatic movement of the end pipe of the arm supplying fluid concrete mixes and air (shotcrete) in machines for lining tunnel vaults and the like, in which electrohydraulic actuators for the movements of the pipe are controlled by sending to them electrical commands in the form of square-wave signals with a variable frequency and in appropriate sequences a , signal being provided for each type of desired movement.
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
- Filed October 14, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 14, 2020.
- 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.