For the Inventor, By the Inventor

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San Leandro, CA, United States of America

Humphrey Instruments Incorporated

USPTO Granted Patents = 34

Trademarks = 1

Forward Citations = 519

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10 inventors (with patents filed for the assignee):

William E Humphrey (28 out of 32 patents)

Charles E Campbell (5 out of 42 patents)

Donald E Lehmer (3 out of 8 patents)

4. Alan L Shinn (2 out of 3 patents)

5. F Stuart Foster (1 out of 15 patents)

6. Alan R Kirschbaum (1 out of 6 patents)

7. Vincent M Patella (1 out of 1 patent)

8. Daniel H Turnbull (1 out of 1 patent)

9. Geoff R Lockwood (1 out of 1 patent)

10. James E Sheedy (1 out of 3 patents)

Core Competencies:

Gaze Tracking

Lensometer

Keratometer

Optical Calibration

Corneal Analysis

Field Tester

High Frequency Transducer

Wide Angle Lens

Reflection Rejection

Automated Readout

Astigmatic Testing

Light Pen

34 patents: Sort by Forward Citations

1. 5491757 - Field tester gaze tracking using content addressable memories to improve (1996-02-13),

2. 5461436 - Color field test with occlusion of non-tested eye (1995-10-24),

3. 5412854 - Method of making a high frequency focused transducer (1995-05-09),

4. 5339151 - Spectrometer for lensometer (1994-08-16),

5. 5323194 - Perimeter with non spherical bowl (1994-06-21),

6. 5303022 - Lensometer with guided lens movement for progressive addition lens (1994-04-12),

7. 4739410 - Superimposed analog video image on plotted digital field tester display (1988-04-19),

8. 4732466 - Fundus camera (1988-03-22),

9. 4730910 - Wide angle lens system having flare rejection properties (1988-03-15),

10. 4707090 - Objective refractor for the eye (1987-11-17),

11. 4695831 - Light pen having actuating accelerometer (1987-09-22),

12. 4675736 - Superimposed analog video image on plotted digital field tester display (1987-06-23),

13. 4669835 - Objective refractor for the eye (1987-06-02),

14. 4650301 - Objective refractor for the eye (1987-03-17),

15. 4640596 - Objective refractor for the eye (1987-02-03),

Humphrey Instruments Incorporated, based in San Leandro, CA, specializes in the design and manufacture of precision instruments and components for various industrial applications. The company focuses on delivering innovative solutions in fluid control and measurement technologies, catering to sectors such as aerospace, automotive, and medical devices. With a commitment to quality and performance, Humphrey Instruments plays a vital role in enhancing operational efficiency and reliability across diverse engineering domains.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

34 Patents

#3 in San Leandro, CA

#2,377 in California

#10,002 in US

#19,612 in the World

San Leandro, CA, United States of America

Humphrey Instruments Incorporated

Forward Citations = 519

10 inventors:

William E Humphrey (28 out of 32 patents)

Charles E Campbell (5 out of 42 patents)

Donald E Lehmer (3 out of 8 patents)

4. Alan L Shinn (2 out of 3 patents)

5. F Stuart Foster (1 out of 15 patents)

Please report any incorrect information to [email protected]

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