Output amplifier
CA 2065447 C · Owner: Johnson, William A. · Inventors: Johnson, William A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An output amplifier having a pair of controlled current generators (25,37,39,47; 26,38,40,48) each with an output impedance (43,45,49; 44,46,49) that is electrically connected to the other, a pair of output controllers (41;42) each of which is across a corresponding one of the output impedances (43,45,49; 44,46,49), and a pair of feedback impedances (33,35; 34,36) each connected from a corresponding one of the output controllers (41;42) to a corresponding one of the controlled current generators (27,37,39,47; 26,38,40,48). A differential amplifier (17,18,22) is provided ahead of the controlled current generators (25,37,39,47; 26,38,40,48) with the amplifier input (10) capacitively (16) …
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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 September 19, 1990 and granted July 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 19, 2012.
- 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.