Secondary containment retrofit bag
CA 2235040 C · Owner: Cornford, Donald A. · Inventors: Cornford, Donald A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A fluid impermeable bag for enclosing a lower portion of a residential heating oil reservoir. The secondary containment has an open upper end, a stiff rim around the open upper end and straps extending from the stiff rim above the open upper end for circling an upper portion of a reservoir. The bag is made of a flexible material whereby the bag is collapsible for installation on a new tank or for retrofitting a reservoir in service. In a second aspect of the invention a flap is detachably affixed to, the rim of the bag and is extendible for covering the upper portion of a reservoir installed outdoors. The bag of the present invention is mountable under a heating oil reservoir and is …
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 April 15, 1998 and granted January 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 15, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2020.
- 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.