Dual coil drive with multipurpose housing
CA 2218471 C · Owner: Harman International Industries, Inc. · Inventors: Button, Douglas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved electromagnetic transducer (20) able to produce more power per mass than a conventional transducer. This increased power per mass is made possible by combining a properly designed housing a neodymium magnet (36) and , a dual coil structure (40). This design dissipates the heat generated by the transducer, increasing the efficiency and power of the transducer. Also by , dissipating heat more efficiently the transducer can be made smaller and more powerful than conventional transducers.
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 November 13, 1995 and granted May 2, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 13, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 2017.
- 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.