Photo-acoustic leak detection system and method
CA 2116345 C · Owner: Laser Imaging Systems · Inventors: Mcrae, Thomas G.; Dewey, Alan H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus and method for the rapid detection and location of a gas leak. A collimated beam of light (16) is scanned (12) across the component (13) under test which has been pressurized with a tracer gas (17) that strongly absorbs the light. When the light passes through the gas (15) emerging from the source of the leak the light energy absorbed by the gas produces an acoustic emission (19) which is detected by a microphone (22). The resulting signal may be processed (20) either as an alarm (21) to notify the operator that a leak is present or, it may be processed in coordination with the light beam scanning mechanism to indicate (26) exactly where the leak is located on the component …
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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 August 20, 1992 and granted June 1, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2014.
- 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.