Transistor direct-coupled amplifier
CA 2065635 C · Owner: Ohno, Masahiko · Inventors: Ohno, Masahiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A transistor direct-coupled amplifier includes a positive-phase direct-coupled amplifier circuit a, second transistor, and a low-pass filter. The positive-phase direct-coupled amplifier circuit uses a base of a first transistor as an input terminal. The second transistor has a collector connected to the input terminal of the positive-phase direct-coupled amplifier circuit and an emitter connected to a reference voltage source, and the second transistor is complementary with the first transistor. A low-pass filter receives an output from the positive-phase direct-coupled amplifier circuit as an input, and the low-pass filter is connected to feed back an output to a base of the second …
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 April 9, 1992 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2014.
- 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.