Bidirectional corrugated pipe-rib seal
CA 2011012 C · Owner: Prinsco, Inc. · Inventors: Seehausen, John L.; Roe, Stephan L.; Bonnema, Eldon G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sealing ring made of an elastomeric readily flowable incompressible material utilized for perfecting a seal between the interior surface of a coupling sleeve and the crest of a rib of a section of corrugated plastic pipe, the sealing ring having a generally flat annular body which in its free form has its major cross-sectional dimension extending radially and being characterized by a series of axially extending ribs, one of which is located on the inner diametrical surface of the ring for securing the ring within the valley between adjacent ribs on the corrugated pipe, a second rib located on the outer circumferential surface of the ring for primarily sealing between the coupling sleeve …
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
- Filed February 27, 1990 and granted October 5, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2012.
- 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.