John P. Hoffman

Person

Peoria, IL, US

People

Patents Grantslast 30 patents

Information Patent Grant
Permanent magnet alternator system for battery charging
- Patent number 6,181,111
- Issue date Jan 30, 2001
- Lowell T. Hoffman
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Method and apparatus for displaying sensor outputs in a diagnostic...
- Patent number 5,949,330
- Issue date Sep 7, 1999
- Caterpillar Inc.
- John P. Hoffman
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Vehicle computer monitoring system screen and display
- Patent number D384341
- Issue date Sep 30, 1997
- Caterpillar Inc.
- John P. Hoffman
- D14 - Recording, communication, or information retrieval equipment
Information Patent Grant
Apparatus for improving the power dissipation of a semiconductor de...
- Patent number 5,646,373
- Issue date Jul 8, 1997
- Caterpillar Inc.
- Larry C. Collins
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Reverse voltage protection circuit
- Patent number 5,546,264
- Issue date Aug 13, 1996
- Caterpillar Inc.
- Gregory L. Williamson
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Dual current sensing driver circuit with switching energization and...
- Patent number 5,541,806
- Issue date Jul 30, 1996
- Caterpillar Inc.
- John P. Hoffman
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Pulse width modulated driver
- Patent number 5,457,435
- Issue date Oct 10, 1995
- Caterpillar Inc.
- John P. Hoffman
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Computerized diagnostic and monitoring system
- Patent number 5,453,939
- Issue date Sep 26, 1995
- Caterpillar Inc.
- John P. Hoffman
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Computerized monitoring system having a programmable gauge
- Patent number 5,374,917
- Issue date Dec 20, 1994
- Caterpillar Inc.
- John P. Hoffman
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Method and apparatus for indicating a changed condition
- Patent number 5,371,487
- Issue date Dec 6, 1994
- Caterpillar Inc.
- John P. Hoffman
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Method and apparatus for indicating faults in switch-type inputs
- Patent number 5,369,392
- Issue date Nov 29, 1994
- Caterpillar Inc.
- John P. Hoffman
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Method and apparatus for modifying the functionality of a gauge
- Patent number 5,361,059
- Issue date Nov 1, 1994
- Caterpillar Inc.
- John P. Hoffman
- G07 - CHECKING-DEVICES
Information Patent Grant
Method and apparatus for reconfiguring a computerized monitoring sy...
- Patent number 5,327,344
- Issue date Jul 5, 1994
- Caterpillar Inc.
- John P. Hoffman
- G07 - CHECKING-DEVICES
Information Patent Grant
Draft control apparatus and method
- Patent number 5,040,119
- Issue date Aug 13, 1991
- Caterpillar Inc.
- Gerald D. Hardy
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
Information Patent Grant
Voltage multiplier circuit
- Patent number 4,982,315
- Issue date Jan 1, 1991
- Caterpillar Inc.
- John P. Hoffman
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Dual current sensing driver circuit
- Patent number 4,967,309
- Issue date Oct 30, 1990
- Caterpillar Inc.
- John P. Hoffman
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Apparatus for selectively positioning movable work element with pre...
- Patent number 4,852,657
- Issue date Aug 1, 1989
- Caterpillar Inc.
- Gerald D. Hardy
- G05 - CONTROLLING REGULATING
Information Patent Grant
Position to duty cycle conversion apparatus and method
- Patent number 4,682,151
- Issue date Jul 21, 1987
- Caterpillar Inc.
- John P. Hoffman
- G08 - SIGNALLING
Information Patent Grant
Dual current sensing driver circuit
- Patent number 4,661,766
- Issue date Apr 28, 1987
- Caterpillar Inc.
- John P. Hoffman
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Power supply circuit
- Patent number 4,394,723
- Issue date Jul 19, 1983
- Caterpillar Tractor Co.
- John P. Hoffman
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Frequency signal conversion apparatus and method
- Patent number 4,383,303
- Issue date May 10, 1983
- Caterpillar Tractor Co.
- John P. Hoffman
- G01 - MEASURING TESTING
Information Patent Grant
Frequency/speed controller
- Patent number 4,348,585
- Issue date Sep 7, 1982
- Caterpillar Tractor Co.
- John P. Hoffman
- G01 - MEASURING TESTING
Information Patent Grant
Apparatus for controlling a member
- Patent number 4,306,449
- Issue date Dec 22, 1981
- Caterpillar Tractor Co.
- John P. Hoffman
- G05 - CONTROLLING REGULATING

John P. Hoffman

Person

Patents Grantslast 30 patents

Permanent magnet alternator system for battery charging

Method and apparatus for displaying sensor outputs in a diagnostic...

Vehicle computer monitoring system screen and display

Apparatus for improving the power dissipation of a semiconductor de...

Reverse voltage protection circuit

Dual current sensing driver circuit with switching energization and...

Pulse width modulated driver

Computerized diagnostic and monitoring system

Computerized monitoring system having a programmable gauge

Method and apparatus for indicating a changed condition

Method and apparatus for indicating faults in switch-type inputs

Method and apparatus for modifying the functionality of a gauge

Method and apparatus for reconfiguring a computerized monitoring sy...

Draft control apparatus and method

Voltage multiplier circuit

Dual current sensing driver circuit

Apparatus for selectively positioning movable work element with pre...

Position to duty cycle conversion apparatus and method

Dual current sensing driver circuit

Power supply circuit

Frequency signal conversion apparatus and method

Frequency/speed controller

Apparatus for controlling a member