For the Inventor, By the Inventor

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Grand Rapids, MI, United States of America

Proofspace, Inc.

USPTO Granted Patents = 2

Forward Citations = 196

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5 inventors (with patents filed for the assignee):

Michael D Doyle (2 out of 30 patents)

Paul F Doyle (1 out of 8 patents)

Robert G Hamilton (1 out of 2 patents)

4. Glenn W Bernsohn (1 out of 3 patents)

5. Marc V Perrone (1 out of 1 patent)

2 patents: Sort by Forward Citations

1. 7017046 - System and method for graphical indicia for the certification of records (2006-03-21),

2. 6381696 - Method and system for transient key digital time stamps (2002-04-30),

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USPTO Data Jan 1 1976 - Jan 13 2026

2 Patents

#167 in Grand Rapids, MI

#3,130 in Michigan

#92,762 in US

Grand Rapids, MI, United States of America

Proofspace, Inc.

Forward Citations = 196

5 inventors:

Michael D Doyle (2 out of 30 patents)

Paul F Doyle (1 out of 8 patents)

Robert G Hamilton (1 out of 2 patents)

4. Glenn W Bernsohn (1 out of 3 patents)

5. Marc V Perrone (1 out of 1 patent)

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