For the Inventor, By the Inventor

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Rochester Hills, MI, United States of America

Bernal, Inc.

USPTO Granted Patents = 3

Trademarks = 3

Forward Citations = 23

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4 inventors (with patents filed for the assignee):

Yu Zhang (1 out of 25 patents)

Tzyh-Chyang Cherng (1 out of 1 patent)

Paul D Pfaff (1 out of 1 patent)

4. Douglas Pfaff (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 7827883 - Cutting die and method of forming (2010-11-09),

2. 4825739 - Punch system for perforating plastic sheets (1989-05-02),

3. 4009625 - Self-stripping punch with ears (1977-03-01),

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USPTO Data Jan 1 1976 - Jan 6 2026

3 Patents

#41 in Rochester Hills, MI

#2,449 in Michigan

#72,066 in US

Rochester Hills, MI, United States of America

Bernal, Inc.

Forward Citations = 23

4 inventors:

Yu Zhang (1 out of 25 patents)

Tzyh-Chyang Cherng (1 out of 1 patent)

Paul D Pfaff (1 out of 1 patent)

4. Douglas Pfaff (1 out of 1 patent)

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