Liquid level gauge

Details Liquid level gauge Liquid level gauge

1976-01-16

1978-05-09

Garvin, Patrick P.

Measuring and testing

Liquid level or depth gauge

Sight glass

106 52, G01F 2302, C03C 304

Patent

active

040880230

ABSTRACT:
A gauge for exhibiting the liquid level in a container of alkaline liquid, for example a boiler or radiator gauge, is disclosed. The gauge includes a glass component composed at least in part of a glass consisting essentially of 20-50% SiO.sub.2, 3-40% Y.sub.2 O.sub.3, 5-25% of a divalent metal oxide and 0-30% Al.sub.2 O.sub.3. Other features of the invention include use of an yttrium concentrate in producing the glass and a composite glass component wherein only a facing portion is composed of the yttrium glass.

REFERENCES:
patent: 707943 (1902-08-01), Rockwell
patent: 1227305 (1917-05-01), Peterson
patent: 2071411 (1937-02-01), Lamesch
patent: 2942469 (1960-06-01), Le Roy
patent: 3148543 (1964-09-01), Le Roy
patent: 3573078 (1971-03-01), Bacon
patent: 3804646 (1974-04-01), Dumbaugh

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