A dispensing device
CA 2121817 C · Owner: Patterson, Denis Arthur John · Inventors: Patterson, Denis Arthur John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dispensing device (50) for dispensing fluent material, e.g. a lubricant, over a prolonged period of time comprising a cylinder (2), a piston (6) and/or extendable membrane separating the cylinder into a fluent material containing first chamber (69) and a second electrolyte containing chamber (9), a sacrificial first electrode (61), a gas-releasing second electrode (63) connected to the first electrode, the electrodes not being in contact with the electrolyte prior to activation of the device, and means for adjusting the surface area of the second electrode which will be exposed for contact with the electrolyte on activation of the device. A method of lubricating a machine bearing is also …
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 November 20, 1992 and granted November 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 20, 2014.
- 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.