Densitometer using microwaves
CA 2256211 C · Owner: Hirai, Renzo · Inventors: Hirai, Renzo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Microwaves are respectively propagated through a reference fluid and fluid to be measured both contained in a detection pipe body and as a result, a first phase lag .theta. 1 and a second phase lag .theta. 2 can be determined on the basis of the microwaves by a phase lag measuring circuit. Then a density computing circuit subtracts the first phase lag .theta. 1 from the second phase lag .theta. 2 to determine a phase difference .DELTA..theta.. When computing the density of matter in the fluid on the basis of the phase difference .DELTA. .theta. the density computing circuit performs density computing processing such that a real second phase lag .theta.2 satisfies the following equation …
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 December 15, 1998 and granted November 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 15, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 15, 2020.
- 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.