Battery monitoring and charging circuit for sump pumps
CA 2015140 C · Owner: Rival Company (The) · Inventors: Greene, James L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of the Invention, A sump pump (86) powered by a rechargeable battery (10) has a circuit for monitoring the battery voltage and controlling charging of the battery (10). Four comparators (16-22) monitor the battery (10) and control two flip flops (52, 74) one of which (52) operates the pump in cooperation with a float switch (54) and the other of which (74) turns the battery charging circuit (114 116, on and off. The circuitry is arranged so that when the battery (10) is in its discharge cycle the float, switch (54) controls the pump (86) and the charging circuit (114, 116) comes on only when the battery voltage is in a low range. In the charging cycle, the pump (86) is locked out in a low …
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 23, 1990 and granted August 31, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 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.