Wavelet analysis for laser ultrasonic measurement of material properties
CA 2224189 C · Owner: Textron Innovations Inc. · Inventors: Kotidis, Petros A.; Reich, Judith
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A laser ultrasonics technique (18) is used to characterize a composite dispersive response signal from a sample under analysis such, as a semiconductor wafer (16). Rather than measuring individual accoustic wave velocities at specific frequencies, an entire dispersive response signal (fig. 8) is analyzed. In a presently preferred embodiment of this invention the entire dispersive response signal is analyzed using a wavelet-based technique (figs. 4a 4b), such as dispersive wavelet , transform analysis technique.
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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, 1997 and granted June 5, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 10, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 10, 2019.
- 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.