Level indicator for liquid reservoirs

Details Level indicator for liquid reservoirs Level indicator for liquid reservoirs

1989-08-18

1991-08-27

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

324639, 73290R, 128DIG13, G08B 2100

Patent

active

050437070

ABSTRACT:
A level indicator for blood reservoirs, in particular of medical apparatus, having a level-responsive component to be provided on the wall of the blood reservoir is provided with an oscillator set to an operating frequency of greater than or equal to 50 MHz and having integrated into its circuit the level-responsive component which, when a preset limiting value is passed, changes the phase condition or amplitude condition decisive for the oscillation of the oscillator.

REFERENCES:
patent: 3588859 (1971-06-01), Petree
patent: 3939360 (1976-02-01), Jackson
patent: 4002996 (1977-01-01), Klebanoff et al.
patent: 4423628 (1984-01-01), Richter
patent: 4589281 (1986-05-01), Aldrich
patent: 4598733 (1986-07-01), Kanno et al.
patent: 4749988 (1988-06-01), Berman et al.
patent: 4833918 (1989-05-01), Jean et al.

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