Title: Liquid level gauge

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.

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Inventors: Berleue, Albert J. (Bradford, NY, US)
Dumbaugh, Jr., William H. (Painted Post, NY, US)

Application Number: 649665
Filing Date: 1976-01-16
Publication_date: 1978-05-09
Assignee: Corning Glass Works (Corning, NY)
Primary Class(es): 73/334 501/31, 501/68, 501/73, 501/152
Other Classes:
US Patent Ref:

707943	Aug, 1902	Rockwell	73/328.
1227305	May, 1917	Peterson	73/328.
2071411	Feb, 1937	Lamesch	73/330.
2942469	Jun, 1960	Le Roy	73/334.
3148543	Sep, 1964	Le Roy	73/331.
3573078	Mar, 1971	Bacon	106/52.
3804646	Apr, 1974	Dumbaugh	106/52.

Other Refs:
Primary Examiner: Garvin, Patrick P.
Assistant Examiner: Wright, William G.
Attorney: Janes, Jr.; Clinton S., Patty, Jr.; Clarence R.