Method and apparatus for butt welding of plastic pipes of large diameter
CA 1162378 A · Owner: Warthmann, Robert · Inventors: Warthmann, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The welding apparatus serves for the purpose of butt-welding Or plastic pipes of diameters larger than 500 mm. All the work is performed by means of the welding apparatus from inside the pipe. Thereby the working time is reduced the, welding quality ensured, and the installation becomes faster. Lifting cranes and heating tents become unnecessary. A novelty is also the possibility of welding pipes together at an angle position. As the welding apparatus is collapsible, it may also be advantageously used for repair work on old pipes in the ground (relining) with a minimum, exposure of the pipes.
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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 February 21, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 21, 2001.
- 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.