Buoyant pump assembly
CA 2089512 A1 · Owner: Pennington, Melvin S. · Inventors: Fowler-Pennington, Veronica J.; Pennington, Melvin S.; Pennington, Melvin S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drilling mud water recovery apparatus for water collecting on drilling mud precipitated out of the mixture includes a buoyant pump assembly free floating on a layer of water above drilling mud. The pump assembly is connected with a source of electrical energy through electrical controls for a predetermined timed operation of the pump and protecting the pump motor against high and low voltages above or below a predetermined value and a current interrupting function in the event of an electrical short. -7-
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 15, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 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.