Plastic pipe joint and method and assembly for making same
CA 1112414 A · Owner: Johns-Manville Corporation · Inventors: French, David W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bell and spigot pipe joint including a bell end having a locked-in sealing gasket and a thickened cross-sectional configuration is disclosed herein. A method and an apparatus for making this bell end with its thickened cross-sectional configuration and with the sealing gasket locked in place are also disclosed herein. In accordance with the present invention the, bell end is formed, its cross-sectional configuration is thickened, and a circumferential sealing gasket is locked in place, all at approximately the same time and using one overall apparatus. Thus in contrast with the prior art the end of the, pipe is not pre-thickened or post-thickened before the bell is formed thereon.
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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 November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 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.