High impedance voltage indicator having capacitive voltage divider
CA 2049685 C · Owner: Schweitzer Engineering Laboratories, Inc. · Inventors: Schweitzer, Edmund O. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A voltage indicator for instantaneously indicating the voltage level on an electrical conductor within a connector component in an AC power distribution system includes a housing for engaging the body of the connector component. Within the housing, the display electrodes of a multi-segment high impedance liquid crystal display component are coupled to the monitored conductor through a capacitive voltage divider to provide an unambiguous bar graph type indication of the voltage level on the conductor.
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 August 22, 1991 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 22, 2013.
- 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.