Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-07-11
1981-10-13
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
340606, 116264, 116275, 200 819R, 73188, G08B 2100, G01F 1506
Patent
active
042951348
ABSTRACT:
A liquid flow detecting device incorporates a static member arranged to be fixed within a passage through which flow of an operating liquid is to take place and an active member held captive by the static member but free to move relatively to the static member to a limited extent in one particular direction at least. The active member has an overall specific gravity substantially the same as that of the chosen operating liquid. Proximity sensing apparatus is included to detect movement of the active member relative to the static member in the particular direction and to issue a corresponding signal.
REFERENCES:
patent: 2580928 (1952-01-01), Kehm
patent: 3057977 (1962-10-01), Caswell
patent: 3559197 (1971-01-01), Jarvis et al.
patent: 3745967 (1973-07-01), Smith et al.
patent: 4101874 (1978-07-01), Denison et al.
patent: 4191951 (1980-03-01), Fuzzell
Caldwell Sr. John W.
Crosland Donnie Lee
Vickers Limited
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