Method and an apparatus for pushing pipes along a pipe line
CA 1303602 C · Owner: Liljehammar, Bertil · Inventors: Liljehammar, Bertil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for pushing forward pipes along a pipe line section is arranged to be brought down into a manhole connected to the pipe line section and includes, a pushing piston (20,26) exerting a pushing force on a pipe (8,12) with support of a holding-up device (2,18). The pushing piston (20) at its leading end carries rods (27) extending essentially to the rear end of the pushing piston and there carry a pressure abutment (28) for bringing the pipe with it during the forward pushing movement of the piston said rods (27) aiding in supporting, the pipe (8). (Figure 1)
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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 June 16, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 16, 2009.
- 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.