Fluid power storage device
CA 2202079 C · Owner: Lee, Wai Cheung · Inventors: Lee, Wai Cheung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In this invention, the prime mover directly or through a slow-down gear train (2) winds up a spring device which may be a spiral spring or simply a rubber band (6). When the energy stored up is great enough an adjustable stopper (8) , automatically releases the spring device being latched which then activates the mechanism or drive the electric generator (9). After a certain amount of energy stored up is released, the latch will automatically be catched by the stopper. Hence the mechanism or the electric generator will be stopped and fluid energy will be started to store up again for the next release of the spring device.
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 October 17, 1994 and granted January 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2016.
- 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.