Programmable triangle wave generator
CA 2000673 C · Owner: Estes, Earl M. Jr. · Inventors: Estes, Earl M. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A triangle wave generator (10) which is programmable and which provides, variable amplitude. frequency independent triangle waves over a wide frequency, bandwidth while employing a low voltage power source. The triangle wave generator (10) comprises a square wave input signal source (12) and a reference voltage signal source (14). A first amplifier (16) amplifies the square wave input signals and couples them by way of a transformer (34) to an integrator (36 40) which generates, triangle wave output signals in response thereto. A second amplifier (18) connected to the triangle wave signal and to the transformer coupled square wave current source for the purpose of providing a bootstrap. A …
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 October 13, 1989 and granted March 22, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 13, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 13, 2011.
- 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.