Environmentally safe underground piping system
CA 2130191 A1 · Owner: Webb, Michael C. · Inventors: Webb, Michael C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A secondarily contained underground piping system which interconnects at least one underground storage tank (TS1 TS2, TS3) , dispensing pump to at least one above-ground dispensing unit. The system includes an originating chamber surrounding the dispensing pump and having at least one opening therein for pipe access thereto. A terminating chamber (CT2) is positioned directly under the above-ground dispensing unit and includes at least one opening therein for pipe access thereto. A transfer pipe (P1 P2) , is operably connected from the dispensing pump to the above-ground dispensing unit, and passes through the openings in the originating chamber and the opening in the terminating chamber …
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 18, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 18, 2015.
- 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.