Method and apparatus for measuring strain
CA 2077085 A1 · Owner: Lonsdale, Bryan · Inventors: Lonsdale, Anthony; Lonsdale, Bryan; Lonsdale, Anthony
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An SAW resonator transducer is provided comprising a substrate on which interdigitated electrodes are deposited the electrodes, having a signal input and a signal output the transducer being, adapted for coupling at a given orientation on a member whose strain is to be measured. A driving signal is applied to the signal input of the transducer and an output resonant frequency is detected at the signal output of the transducer when it is driven by the driving signal. The output signal is processed to derive information as to the strain generated in the transducer induced by stress in the substrate due to stress applied to the substrate by way of a member to which the transducer is coupled.
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 March 4, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 2013.
- 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.