Liquid level sensor with level alarm

Details Liquid level sensor with level alarm Liquid level sensor with level alarm

2008-06-20

2010-02-09

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

C073S299000

Reexamination Certificate

active

07658104

ABSTRACT:
A liquid level sensor system actuated by a column pressure includes a hollow member having a distal open end adapted to be positioned into a liquid reservoir to a depth below a liquid surface level, and a sensor head unit. The sensor head unit is responsive to the column pressure to provide an indication of a liquid level in the reservoir. A low liquid level alarm circuit is responsive to the bellows member to generate a signal indicative of a low liquid level state.

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Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration—Jun. 18, 2008—PCT/US2008/002767.
Office Action mailed Apr. 25, 2008 in connection with U.S. Appl. No. 11/743,111.
Notification re Transmittal of International Search Report and Written Opinion of ISA; PCT/US2009/047841; mailed Jul. 30, 2009.

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