Magnetic developing agent level detection apparatus using an osc

Details Magnetic developing agent level detection apparatus using an osc Magnetic developing agent level detection apparatus using an osc

1978-03-08

1980-01-29

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324204, 222DIG1, 340617, 340195, 222 64, 118712, G01F 2328

Patent

active

041863410

ABSTRACT:
In detecting the presence or absence of a developing agent or determining the residual amount thereof, at least one coil is arranged outside a developing agent container, so that a change in magnetic permeability caused by the presence or absence of a developing agent within the container or a change in the amount thereof can be detected as a change in the inductance of the coil.

REFERENCES:
patent: 3511580 (1970-05-01), Eckhardt et al.
patent: 3588859 (1971-06-01), Petrec
patent: 3853246 (1974-12-01), Dubois

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