Treating, including induction heating of well pipe connections
CA 1106923 A · Owner: Hydril Company · Inventors: Bollfrass, Charles A.; Lewis, George E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Treatment of a steel well pipe connection involves use of an electrical coil and a cylindrical sleeve carrying the coil, and includes the steps of:, a) relatively applying the sleeve to a position about the pipe connection so that the coil extends about the connection;, b) passing electrical current through the coil to effect induction heating of the connection temperatures within a range of between about 75°F and 500°F; and c) relatively removing the sleeve from said position.
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 August 11, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 11, 1998.
- 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.