Debris catcher for manholes and catch basins
CA 2278671 C · Owner: Johnson, Eric A. · Inventors: Johnson, Eric A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An annular ring (12) and cap (14) that are positionable within a manhole or catch basin structure above the base (46) of the manhole or catch basin to reduce the amount of debris entering into the manhole or catch basin. The annular ring (12) may be positioned within the manhole or catch basin such that a flange (20) of the annular ring (12) is sandwiched between the base (46) and support frame (50). When a final grade surrounding the manhole or catch basin is complete and the cover or grating is positioned above the support frame (50), the cap (14) then serves as a secondary restriction thereby deterring access to underground conduits that are linked to the manhole or catch basin. …
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 May 14, 1997 and granted March 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2019.
- 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.