Friction flowmeter
CA 2317445 A1 · Owner: Rosemount Inc. · Inventors: Broden, David A.; Wiklund, David E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pressure transmitter (144) produces signals indicative of a flow in a pipe (132, 536, 584, 608). The transmitter (144) has a pressure sensor (252) that is fluidly coupled to two ports (136, 138) in the pipe and the pipe has a , substantially constant cross section between the two ports. Aspects of the invention include a circuit (280, 282) coupled to the pressure sensor that produces a digital value related to the fluid flow as a function of the pressure difference between the two ports.
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 13, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 13, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 13, 2021.
- 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.