Manhole seal and method of installation therefor
CA 1079993 A · Owner: Vibrapipe Concrete Products Ltd. - Les Produits De Beton Vibrapipe Limit Ee · Inventors: Palazzo, Dominic
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a novel rubber seal which is formed in place in a circular entry port in a concrete manhole for a sewer pipe, thereby providing a water-tight seal between the manhole rim and the sewer pipe and a novel method of forming the seal in place in association with the concrete manhole when it is formed of concrete. The invention comprises a sealing ring for sealing the annular opening existing in a plane between an inner circular shaped member and an outer circular shaped member comprising a generally circular ring member having a generally V-shaped cross-sectional shape the two legs of the, V-cross-section shaped sealing ring member being embedded in the peripheral …
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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 June 24, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 24, 1997.
- 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.