Fluent material handling – with receiver or receiver coacting mea – With signal – indicator – recorder – inspection means or exhibitor – Level or pressure in receiver
Reexamination Certificate
2006-11-28
2006-11-28
Douglas, Steven O. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
With signal, indicator, recorder, inspection means or exhibitor
Level or pressure in receiver
C141S198000, C137S501000, C137S315040
Reexamination Certificate
active
07140404
ABSTRACT:
A method and apparatus are provided for monitoring a liquid level in a closed tank with a differential pressure sensor module disposed in a bottom portion of the tank, by routing a pressure reference tube extending from the pressure sensor module through the interior of the tank and attaching an opposite, open, vented end of the pressure reference tube to the tank at a point inside of the tank in an upper portion of the tank.
REFERENCES:
patent: 4522227 (1985-06-01), Mylander
patent: 5456280 (1995-10-01), Palmer
patent: 5584278 (1996-12-01), Satoh et al.
Title: Pressure Sensor Cap Assembly with Connectors, Adapter, Seal Ring and PG7 Th'd Cable Gland; Gems Sensors Inc. Drawing No. 7801092, Jul. 30, 2001, Gems Sensors Inc., One Cowles Road, Plainville, CT USA 06062-1198.
Cupples Kenneth Alan
Schenk, Jr. William Peters
Douglas Steven O.
Reinhart Boerner Van Deuren P.C.
Robertshaw Controls Company
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