Pipe seal
CA 1269681 C · Owner: Press-Seal Gasket Corporation · Inventors: Skinner, James W.; Deeb, Fouad M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gasket system is disclosed for providing fluidtight joint between a manhole riser and a sewer pipe. The gasket is formed with a mounting portion which is generally cylindrical, and provides an anchoring prosection extending radially from the outer side thereof. A sealing projection is joined to the mounting portion by a hinge section. The sealing protection is placed in compression when the gasket is formed into a circle and, becomes bistable. In one position of stability the, sealing projection is substantially aligned with the mounting portion, and in the other position of stability the sealing projection is located generally within the mounting portion. The gasket is positioned around …
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 29, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 29, 2007.
- 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.