Sonic emitter with foam stator
CA 2317631 A1 · Owner: American Technology Corporation · Inventors: Croft, James J. Iii; Norris, Elwood G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A speaker device comprising an electrostatic emitter film (15) which is responsive to an applied variable voltage (13) to emit sonic output (11) based on a desired sonic signal, used in combination with at least a first foam member (20) having a forward face (21) an intermediate core section (22) and a rear face (23). The forward face (21) is composed of a composition having sufficient stiffness to support the electrostatic film (15) and includes conductive properties which enable application of a variable voltage to supply the desired sonic signal. The surface of the forward face (21) includes small cavities (26) having surrounding wall structure defining each cavity which …
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 7, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 7, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 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.