Direct digital technique for generating an ac waveform
CA 1095983 A · Owner: Westinghouse Electric Corporation · Inventors: Culbertson, Charles H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
46,178, DIRECT DIGITAL TECHNIQUE FOR, GENERATING AN AC WAVEFORM ABSTRACT OF THE DISCLOSURE, A digital circuit employing a programmable read only memory (PROM) provides direct digital driving of semiconductor devices comprising a bridge clrcuit of an inverter to develop a predetermined AC output waveform. The combination of the programmable read only memory and an up-down counter provides the capability of stopping the output waveform at predetermined points as well as reversing the phase direction of the AC output waveform to thereby permit greater control of an electrical system driven by the AC output waveform.
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 February 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 17, 1998.
- 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.