E-field detector and annunciator
CA 2032491 A1 · Owner: Johnson, Michael J. · Inventors: Johnson, Michael J.; Johnson, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The voltage potential and E-field occurring at the site of a circuit discontinuity (98) is detected in a string of light bulbs (1--R, R+1--N). A signal Vac is applied across the string. Capacitive pickups (90 92) are connected in series to an LCD, annunciator (100). The pickups (90 92) are coupled to the string so as to bridge the discontinuity (98). When the E-field generated by the, discontinuity (98), is above the threshold energy level required by the LCD annunciator (100) the fault condition is indicated to the user.
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 May 4, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 4, 2012.
- 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.