George G Codina

US Patent:

6698974, Mar 2, 2004

Filed:

Dec 11, 2001

Appl. No.:

10/015100

Inventors:

George Codina - Gardena CA
Dean R. Potts - Maple Grove MN
Thomas J. Richards - Peoria IL

Assignee:

Caterpillar Inc - Peoria IL

International Classification:

E01C 1938

US Classification:

404117, 404122

Abstract:

A system for variably powering and vibrating a compaction roller on a compacting machine for use in compacting surfaces. The system includes a chassis and at least one compaction roller rotatably journaled to the chassis. The compaction roller forms the rotor of a variable reluctance motor for driving the roller in a rotational manner and for vibrating the roller.

US Patent:

20010022472, Sep 20, 2001

Filed:

Sep 30, 1999

Appl. No.:

09/408708

Inventors:

GEORGE CODINA - PLAYA DEL REY CA, US
THOMAS J. RICHARDS - PEORIA IL, US

International Classification:

H02J009/00

US Classification:

307/066000

Abstract:

A method and apparatus for providing uninterrupted power during transitions between a primary power source and a standby power generator. The method and apparatus includes determining one of a power failure condition and a power return condition of the primary power source, transitioning between the primary power source and the standby power generator, and providing power to a load during the transition, the power being supplied by an uninterruptable power supply (UPS) having a capacitor supplied voltage.

US Patent:

56315686, May 20, 1997

Filed:

Aug 31, 1995

Appl. No.:

8/522472

Inventors:

George Codina - North Hollywood CA
Donna J. Murr - Dunlap IL
Chandrasekar Ramamoorthy - Normal IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

G01R 2726

US Classification:

324690

Abstract:

An apparatus for determining the remaining life of hydraulic fluid in a hydraulic system having a hydraulic container includes a capacitor formed by a pair of electrodes. A charging circuit produces a charging current of constant magnitude. The charging current is used to charge the capacitor to a predetermined voltage. A timing circuit measures the elapsed time between the time at which the charging circuit begins to produce the charging current and the time at which the capacitor has been charged to the predetermined voltage. The timing circuit also produces a pulse width modulated signal. The magnitude of the pulse width modulated signal is indicative of the time difference. A controller receives the pulse width modulated signal and determines the life of the hydraulic fluid.

US Patent:

54978041, Mar 12, 1996

Filed:

Jun 27, 1994

Appl. No.:

8/266060

Inventors:

George Codina - North Hollywood CA
Eldon D. Oestmann - Morton IL
Gary J. Shane - Edelstein IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

F16K 3700

US Classification:

137554

Abstract:

An apparatus for determining the spool position of a directional valve is disclosed. A longitudinal valve housing has opposed ends and a plurality of fluid ports, and a spool moves reciprocatingly within the valve housing. A first spring disposed adjacent an end of the spool extends and retracts with the reciprocating movement of the spool. A first oscillator circuit is coupled to the first spring and is adapted to produce a first position signal in response to the inductance of the first spring. Finally, a logic device determines the incremental linear position of the spool relative to the housing in response to the frequency of the first position signal.

US Patent:

56707215, Sep 23, 1997

Filed:

Aug 31, 1995

Appl. No.:

8/521601

Inventors:

George Codina - North Hollywood CA
Chandrasekar Ramamoorthy - Normal IL
Donna J. Murr - Dunlap IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

G01L 912

US Classification:

73754

Abstract:

An apparatus for measuring the pressure of a liquid in a container includes a capacitor formed by a pair of electrodes. A charging circuit produces a charging current of constant magnitude. The charging current is used to charge the capacitor to a predetermined voltage. A timing circuit measures the elapsed time between the time at which the charging circuit begins to produce the charging current and the time at which the capacitor has been charged to the predetermined voltage. The timing circuit produces a pulse width modulated signal. The magnitude of the pulse width modulated signal is indicative of the time difference and thus, the pressure within the container.

US Patent:

46677380, May 26, 1987

Filed:

Apr 29, 1985

Appl. No.:

6/728612

Inventors:

George Codina - Hartsdale NY

Assignee:

CEEE Corporation - Stamford CT

International Classification:

E21B 4326
E21B 4900

US Classification:

166248

Abstract:

Disclosed is a method and apparatus for enhancing oil and/or gas production from a subterranean well by using high energy, short duration electrical pulses to fracture underground rock formations containing entrapped oil or gas. The invention obviates the large power requirements of the prior art devices by generating a series of constant pulses having different durations into the rock formation to determine its characteristic impedance. Once the characteristic impedance has been determined, a second pulse having an amplitude and duration matching this characteristic impedance is discharged into the rock formation to alter its dynamic characteristics. A third pulse is then discharged into the rock formation to cause its fracture.

US Patent:

56728310, Sep 30, 1997

Filed:

Aug 31, 1995

Appl. No.:

8/522024

Inventors:

George Codina - North Hollywood CA
Chandrasekar Ramamoorthy - Normal IL
Donna J. Murr - Dunlap IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

G01F 156

US Classification:

7386112

Abstract:

An apparatus for measuring the flow rate of a liquid in a line includes a capacitor formed by a pair of electrodes. A charging circuit produces a charging current of constant magnitude. The charging current is used to charge the capacitor to a predetermined voltage. A timing circuit measures the time between the time at which the charging circuit begins to produce the charging current and the time at which the capacitor has been charged to the predetermined voltage. The timing circuit produces a pulse width modulated signal. The magnitude of the pulse width modulated signal is indicative of the time difference.

US Patent:

61527025, Nov 28, 2000

Filed:

Mar 24, 1999

Appl. No.:

9/275300

Inventors:

George Codina - North Hollywood CA
Donna J. Murr - Dunlap IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

F04B 4900

US Classification:

417 63

Abstract:

An apparatus and method for sensing a parameter of a hydraulic pump. The hydraulic pump includes a housing and an input shaft. The shaft is rotationally driven relative to the housing and electrically coupled to the housing. The hydraulic pump forms a variable capacitor. The apparatus includes an electrode portion positioned adjacent to the input shaft and is electrically isolated from the housing and input shaft. The electrode portion and the input shaft form a fixed capacitor. The fixed capacitor and the variable capacitor are coupled. The apparatus supplies electrical energy to the electrode portion and produces a capacitive signal indicative of the capacitance value of the variable capacitor. The apparatus further applies a filter to the capacitive signal and produces a filtered capacitive signal. The parameter of the hydraulic pump is determined as a function of the filtered capacitive signal.