Apparatus and method for testing for valve leaks by differential signature methods
CA 2173794 C · Owner: Leak Detection Services, Inc. · Inventors: Dimmick, Joseph G.; Powell, Lloyd E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A portable computing device is used for acoustic testing of valve systems for valve, leaks. Transducers are applied to appropriate locations in the valve system to obtain sound, signals, which are fast Fourier transformed into valve signatures. Multiple signatures are, displayed simultaneously and are compared automatically by the system to derive a, recommended result and manually to make determinations of valve leaks by the differential, signature method or the like. The signatures and the user's determinations are stored on a, hard drive. Various panels are displayed to give the user step-by-step instructions for, performing the test. Thus training is simplified, use of paper is …
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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 April 10, 1996 and granted January 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 10, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 10, 2018.
- 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
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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.