Drain apparatus with liquid trap and liquid level indicator

Details Drain apparatus with liquid trap and liquid level indicator Drain apparatus with liquid trap and liquid level indicator

2007-05-15

2007-05-15

Rivell, John (Department: 3753)

Fluid handling

With indicator, register, recorder, alarm or inspection means

Liquid level responsive indicator, recorder or alarm

C137S247490, C137S362000, C004S679000, C404S004000, C073S322000

Reexamination Certificate

active

10868072

ABSTRACT:
A buoyant liquid level indicator device is positioned within liquid drain apparatus having a trough accommodating liquid to form a liquid seal to prevent passage of gas through the liquid drain apparatus. The indicator device will float and be exposed to an outside observer only when a liquid seal is formed by the liquid drain apparatus.

REFERENCES:
patent: 588605 (1897-08-01), Robinson et al.
patent: 1586201 (1926-05-01), Kauffmann
patent: 1778840 (1930-10-01), Wale
patent: 1978185 (1934-10-01), Booss
patent: 1999272 (1935-04-01), Austin
patent: 2630875 (1953-03-01), Sachs
patent: 2985187 (1961-05-01), Hamilton
patent: 3832970 (1974-09-01), Nilsson
patent: 5192156 (1993-03-01), Webb
patent: 6049922 (2000-04-01), Gleason
patent: 6786091 (2004-09-01), Aleali
patent: 2001/0050257 (2001-12-01), Houck et al.

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