Expired Canadian patentCanada
Ultrasonic flow meter
CA 2071876 C · Owner: Siemens Aktiengesellschaft · Inventors: Russwurm, Winfried
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ultrasonic flow meter with a W-shaped ultrasound path inside the measurement tube (1) and with a stepped elevation/depression of the internal wall of the tube at the site of reflection of the parasitic V-shaped path.
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 13, 1990 and granted November 21, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 13, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 13, 1990
GrantedNovember 21, 2000
Term endedDecember 13, 2010
Patent numberCA 2071876 C
Classification (IPC)G01F1/66
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.