John Philip Adamson

US Patent:

41941772, Mar 18, 1980

Filed:

Nov 25, 1977

Appl. No.:

5/854917

Inventors:

John S. Adamson - Pleasant Hill CA

Assignee:

Chevron Research Company - San Francisco CA

International Classification:

G08C 1916
H04Q 914

US Classification:

340152T

Abstract:

The liquid level within a storage tank network is continuously monitored by a transducer system of the present invention formed essentially of MSI's (Medium Scale Integrated Chips) including a differential pressure (dp) cell in circuit with a digital volt meter (DVM) which, in turn, is connected to a series of look-up ROM's (Read-Only Memories). In operation and as a function of dp cell output level, DVM is continuously applying BCD signals to the ROM's, such signals being proportional to liquid level. The ROM's retain, in memory, the Gray code translations of the BCD input. The ROM's are then periodically accessed via an analog multiplexer controlled by an oscillator/ripple counter to provide corresponding microcircuit level signals at the output of a 7-segment decoder/driver. Thereafter, the microcircuit signals are regenerated--at levels compatible with conventional MARK-SPACE tank gauging systems--using an isolation/driver network in circuit with the 7-segment decoder/driver. The aforementioned system is initiated by a MARK-SPACE interrogation signal and has special utility in digitally monitoring product/source levels within source/product storage tank networks associated with an oil refinery and/or a chemical complex.

US Patent:

42030900, May 13, 1980

Filed:

Nov 25, 1977

Appl. No.:

5/855033

Inventors:

John S. Adamson - Pleasant Hill CA

Assignee:

Chevron Research Company - San Francisco CA

International Classification:

G08C 1916
H04Q 914

US Classification:

340152T

Abstract:

A "red-alert" end condition digital signal is generated by a transponder system of the present invention formed essentially of MSI's (Medium Scale Integrated Chips) including an oscillator/ripple counter controlling a coded analog multiplexer network in circuit with a RTL compatible gate/driver circuit. The aforementioned system both is initiated by and is in power dependent relationship with a MARK-SPACE interrogation signal and has special utility in digitally monitoring product "overflow" conditions in source/product storage tank networks associated with an oil refinery and/or a chemical complex.

US Patent:

41715209, Oct 16, 1979

Filed:

Nov 25, 1977

Appl. No.:

5/855032

Inventors:

John S. Adamson - Pleasant Hill CA

Assignee:

Chevron Research Company - San Francisco CA

International Classification:

H04Q 900
G08B 2100

US Classification:

340152T

Abstract:

A "red-alert" end condition digital signal is generated by a transponder system of the present invention formed essentially of MSI's (Medium Scale Integrated Chips) including an oscillator/ripple counter controlling a fixed Gray code logic encoding network in circuit with a driver circuit. The aforementioned system both is initiated by and is in power dependent relationship with a MARK-SPACE interrogation signal and has special utility in digitally monitoring product "overflow" conditions in source/product storage tank networks associated with an oil refinery and/or a chemical complex.