Pipe internal towing carriage
CA 1187334 A · Owner: Yastrebov, Petr I. · Inventors: Mutin, Felix I.; Yastrebov, Petr I.; Morgun, Vasily M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract A pipe internal towing carriage comprises friction rollers intended for engagement with the internal periphery of the pipe, the friction rollers being mounted successively on a drive shaft such that their axes of rotation are mutually parallel and intersect the axis of rotation of the shaft. The shaft has a stepped configuration each of the, steps carrying one of the rollers the steps being axially, offset relative to each other lengthwise of the shaft.
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 May 21, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 21, 2002.
- 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.