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Calgary, Canada

Frederick N Trofimenkoff

USPTO Granted Patents = 10

Average Co-Inventor Count = 3.5

ph-index = 6

Forward Citations = 151(Granted Patents)

Company Filing History:

Weatherford/lamb, Inc.

Universal Skate Sharpener Ltd.

Trofimenkoff Engineering, Ltd.

University of Calgary

5. 6 out of 832,880

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patents

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Years Active: 1980-2006

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10 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7093680 - Subsurface signal transmitting apparatus (2006-08-22),

2. 6672383 - Subsurface signal transmitting apparatus (2004-01-06),

3. 6405795 - Subsurface signal transmitting apparatus (2002-06-18),

4. 6209632 - Subsurface signal transmitting apparatus (2001-04-03),

5. 5909132 - Resistance bridge and its use in conversion systems (1999-06-01),

6. 5877637 - Resistance bridge and its use in conversion systems (1999-03-02),

7. 4847620 - Clock-controlled voltage-to-frequency converter (1989-07-11),

8. 4827261 - Clock-controlled pulse width modulator (1989-05-02),

9. 4558301 - Voltage-to-frequency and analog-to-digital converter circuit (1985-12-10),

10. 4235050 - Skate sharpening apparatus (1980-11-25),

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