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)

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 is a leading manufacturer of precision optical instruments. With over 50 years of experience, we specialize in designing and manufacturing a wide range of high-quality ophthalmic instruments, including lens measuring devices, refractors, corneal topographers, and more. Our commitment to innovation, accuracy, and customer satisfaction has made us a trusted name in the industry. Visit our website to explore our product offerings and learn more about our company.

This text is generated by artificial intelligence and may not be accurate.

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USPTO Data Jan 1 1976 - Sep 15 2026

34 Patents

#3 in San Leandro, CA

#2,370 in California

#9,985 in US

#19,578 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)

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