Fluid flow regulating valve
CA 2102877 C · Owner: Kohler Co. · Inventors: Feld, Todd R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The stem of a needle valve for regulating fluid flow is threaded into the valve housing. A reversible electric motor, whose shaft engages the stem coaxially rotates the, stem and causes it to move the plug on the end of the stem into and out of a fluid flow port. A helical spring slidably located in a longitudinal bore in the stem is compressed by the shaft to urge the stem toward the housing in order to maintain a working threadable connection between the stem and the housing even when the stem is almost completely withdrawn.
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 10, 1993 and granted July 7, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2015.
- 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.