Filter change indicator

Details Filter change indicator Filter change indicator

2006-11-17

2008-08-19

Allen, Andre J (Department: 2855)

Measuring and testing

Fluid pressure gauge

Electrical

C257S302000, C073S723000

Reexamination Certificate

active

07412896

ABSTRACT:
A fluid system pressure indicator is adapted for use in fluid systems having a filter element. The fluid system force indicator includes a housing partitioned to be exposed to the fluid system to provide transmission of a mechanical force between these partitioned environments to indicate the fluid pressure. This exterior shape change is such that it can be identified through tactile means not requiring visual identification.

REFERENCES:
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patent: 4272368 (1981-06-01), Foord et al.
patent: 4366717 (1983-01-01), Foord et al.
patent: 4654643 (1987-03-01), Meisenheimer, Jr.
patent: 4818385 (1989-04-01), Medley, III
patent: 6190442 (2001-02-01), Redner
patent: 2004/0113803 (2004-06-01), Keown

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