Photoetching of acoustic lenses for aip
CA 2283551 C · Owner: Elrod, Scott A. · Inventors: Apte, Raj B.; Elrod, Scott A.; Biegelsen, David K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of fabricating a lens comprising providing a photosoluble substrate having opposed first and second surfaces; exposing one of the surfaces of, the substrate to a photoactive etchant; and exposing said etchant to patterned light, such that a convex or concave, generally semi-spherical bulge or recess is formed in, said substrate.
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 September 24, 1999 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 24, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 2021.
- 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.