A 3-d acoustic infinite element based on an ellipsoidal multipole expansion
CA 2227968 C · Owner: Lucent Technologies Inc. · Inventors: Holford, Richard Lovell; Burnett, David Storer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an improvement over conventional finite element techniques an, ellipsoidal infinite element is used far the modeling of acoustic fields in exterior fluid-filled domains surrounding a structure. This ellipsoidal infinite element is based on a multipole expansion that describes to arbitrary accuracy, any, scattered and/or radiate field exterior to an ellipsoid. Significantly the, respective eccentricities of the three elliptical cross sections of the ellipsoid can take values that are arbitrary and mutually independent. The ellipsoidal infinite element is readily incorporated in any structural or acoustic finite element code.
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 January 26, 1998 and granted April 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 26, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 26, 2020.
- 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.