Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative
Patent
1990-08-31
1992-03-10
Harvey, Jack B.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonquantitative
324 96, 324543, G01R 19165, G01R 3102
Patent
active
050952650
ABSTRACT:
An indicator for instantaneously indicating the presence of voltage on a monitored electrical conductor of an AC power distribution system utilizes a high impedance liquid crystal display component providing an "N" display in response to an applied signal. The "N" segment display electrode and associated backplane display electrode are capacitively coupled to the monitored conductor and system ground to provide an "N" display when voltage is present on the conductor.
REFERENCES:
patent: 3614610 (1971-10-01), Legatti
patent: 3660757 (1972-05-01), Winslow
patent: 3667039 (1972-05-01), Garfein et al.
patent: 3774195 (1973-11-01), Schulthess et al.
patent: 3906477 (1975-09-01), Schweitzer, Jr.
patent: 4139820 (1979-02-01), Rode
patent: 4152639 (1979-05-01), Chaffee
patent: 4152643 (1979-05-01), Schweitzer, Jr.
patent: 4259634 (1981-03-01), Okamoto et al.
patent: 4263550 (1981-04-01), Schweitzer, Jr.
patent: 4301407 (1981-11-01), Koslar
patent: 4438403 (1984-03-01), Schweitzer, Jr.
patent: 4458198 (1984-07-01), Schweitzer, Jr.
patent: 4495489 (1985-01-01), Schweitzer, Jr.
patent: 4503389 (1985-03-01), Singer
patent: 4550288 (1985-10-01), Schweitzer, Jr.
patent: 4559496 (1985-12-01), Harnden, Jr. et al.
patent: 4641220 (1987-02-01), Schweitzer, Jr.
patent: 4686518 (1987-08-01), Schweitzer, Jr.
patent: 4714916 (1987-12-01), Schweitzer, Jr.
patent: 4794329 (1988-12-01), Schweitzer, Jr.
patent: 4794332 (1988-12-01), Schweitzer, Jr.
patent: 4823078 (1989-04-01), Mohebban
"Liquid Crystal Display", a publication of Hamlin Inc., Lake and Grove Street, Lake Mills, Wis., circa Jun. 1, 1989.
"Electronically Scanned Analog Liquid Crystal Displays", by R. A. Soref, Applied Optics, Jun. 1970, vol. 9, No. 6.
LandOfFree
Circuit status indicator having liquid crystal display does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit status indicator having liquid crystal display, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit status indicator having liquid crystal display will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2287033