Pipe
CA 1237375 A · Owner: Gebelius, Sven R. V. · Inventors: Gebelius, Sven R.V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a metal pipe com-, prising, as a continuous length of pipe portions having a, substantially smooth wall surface separated from each other by means of intermediately located waveshaped or creased portions shaped from the pipe length, said waveshaped or creased portions being hobbings or stampings which only partly surround the circumference of the pipe length and having an external diameter substantially corresponding to the external diameter of intermediately located portions of the metal pipe the hob-, bing or stamping depth being maintained substantially constant in the entire extension of surrounding waveshaped or creased portions.
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 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- 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.