Apparatus for detecting unsymmetrical bipolar waveforms
CA 1324207 C · Owner: Chow, Kung Chung · Inventors: Chow, Kung Chung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
18-, Abstract of the Disclosure, A predetermined unsymmetry of a bipolar waveform is detected by apparatus which includes a circuit which generates a pulse for each zero crossing of the waveform. Each zero crossing pulse triggers a first retriggerable oneshot for a first interval T1. Timing out of the first oneshot triggers a second retriggerable one-shot for a second interval T2. If both the first and second one-shots have timed out a third one-shot is triggered for a third interval T3. The intervals are selected such that twice T1 plus T2 is equal to the period of one cycle of the bipolar waveform so that triggering of the third one-shot is an indication of a predetermined unsymmetry …
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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
- Granted November 9, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 9, 2010.
- 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
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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.