Communications: electrical – Systems – Call station
Patent
1977-01-19
1978-02-07
Caldwell, Sr., John W.
Communications: electrical
Systems
Call station
141 7, 141 59, 141 95, 141290, 364510, G08B 2100
Patent
active
040729346
ABSTRACT:
A method and apparatus for detecting blockages in one or more vapor flow lines such as vapor recovery lines used in liquid gasoline dispensing systems. The method and apparatus operate by sensing pressure in vapor flow lines and determining whether the frequency of the variations in the filtered rate of change with time of the pressure signal exceeds a preset limit indicating vapor bubbling through a liquid blockage. The method and apparatus also operate to determine whether the pressure signal exceeds a preset limit indicating a blockage condition.
REFERENCES:
patent: 3723987 (1973-03-01), Barone, Jr. et al.
patent: 3911975 (1975-10-01), VAN Soestbergen et al.
patent: 3955070 (1976-05-01), Suzuki et al.
patent: 3978462 (1976-08-01), Goodman
patent: 3983913 (1976-10-01), Bower
patent: 4014010 (1977-03-01), Jinotti
Hamstra David C.
Hiller Trueman W.
Caldwell Sr. John W.
Myer Daniel
Wylain, Inc.
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