Sidestream flow sensor for spirometry
CA 2086962 A1 · Owner: Neville, Dee J. · Inventors: Neville, Dee J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved spirometer for measuring the flow rate of breaths includes a mainstream conduit having a fixed or variable restrictor formed therein for producing a pressure differential across the restrictor, and one or more sidestream conduits having a first end in fluid communication with the mainstream conduit upstream of the, restrictor, and a second end in fluid communication with the restrictor. A thermal flow sensor is disposed within each sidestream conduit, and includes a heater element and a pair of temperature sensors located upstream and downstream of the heater element connected in a bridge configuration to generate an analog signal for output to a data processing system to …
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 8, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 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.