Sinusoidal oscillator with electronically variable frequency
CA 1052452 A · Owner: Sperry Rand Corporation · Inventors: Cloke, Robert L.; Sordello, Frank J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sinusoidal oscillator includes a transistor amplifier and a feedback circuit. The transistor emitter circuit includes an inductor in parallel with a series-connected capacitor and variable resistance for electronically varying the frequency of oscillation by altering the phase angle of the amplifier circuit phase shift. The variable resistance can be constituted by a variable resistor or by diodes supplied with a controlled current.
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
- Granted April 10, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 10, 1996.
- 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.