Battery charging system
CA 2034490 C · Owner: Johnson, Robert M. Jr. · Inventors: Johnson, Robert M. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A battery charging system including a battery of one chemistry type and a battery charger for a different battery type is disclosed. If a battery over-discharge condition or if an electrochemical cell (201 202, 203, 204) imbalance is detected within the battery, the battery prevents charging by the battery charger by means of a resettable switch (226 227, 228, 229, 217).
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 June 8, 1990 and granted January 23, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 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.