For the Inventor, By the Inventor

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Fairport, NY, United States of America

Gca Corporation/tropel Division

USPTO Granted Patents = 2

Forward Citations = 14

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5 inventors (with patents filed for the assignee):

John H Bruning (1 out of 30 patents)

Joachim Bunkenburg (1 out of 6 patents)

Gunnar D Richardson (1 out of 1 patent)

4. Robert A Smythe (1 out of 1 patent)

5. Graham J Siddell (1 out of 1 patent)

2 patents: Sort by Forward Citations

1. 4790642 - Integrated metrology for microlithographic objective reducing lens (1988-12-13),

2. 4509858 - Compact, linear measurement interferometer with zero abbe error (1985-04-09),

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USPTO Data Jan 1 1976 - Jan 20 2026

2 Patents

#24 in Fairport, NY

#5,669 in New York

#92,911 in US

Fairport, NY, United States of America

Gca Corporation/tropel Division

Forward Citations = 14

5 inventors:

John H Bruning (1 out of 30 patents)

Joachim Bunkenburg (1 out of 6 patents)

Gunnar D Richardson (1 out of 1 patent)

4. Robert A Smythe (1 out of 1 patent)

5. Graham J Siddell (1 out of 1 patent)

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