Dual piston variable proportioning system
CA 2230722 C · Owner: S. C. Johnson Commercial Markets, Inc. · Inventors: Poutiatine, Andrew I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A proportioning system (20) includes first and second cylinder and piston arrangements (26, 28) with an actuator (30) operably engaging the first and second cylinder and piston arrangements (26 28). By changing the diameter , and/or stroke of the pistons (54 56), the mix ratio of two dispensed fluids changes. By changing the pivot point (32) of the actuator (30) the stroke , length can be changed. The proportioning system (20) also includes a safety mechanism which prevents a concentrated fluid from being dispensed should the reservoir of diluting fluid be depleted.
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 January 17, 1997 and granted December 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2019.
- 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.