Forward Citations = 106

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3 inventors (with patents filed for the assignee):

David E Hall (2 out of 63 patents)

Stephen H Mayer (2 out of 2 patents)

Louis M Crain (2 out of 2 patents)

4 patents: Sort by Forward Citations

1. 5224176 - Automated coin grading system (1993-06-29),

2. 5220614 - Automated coin grading system (1993-06-15),

3. 5109977 - Tamperproof coin case (1992-05-05),

4. 5042650 - Tamperproof coin case (1991-08-27),

Professional Coin Grading Service (PCGS) is a leading third-party coin authentication and grading company. They offer expert, unbiased opinions on coins' authenticity and condition, providing collectors and investors with confidence and security in their numismatic pursuits. With a team of experienced and knowledgeable experts, PCGS has become a trusted and respected name in the coin industry, setting the standard for coin grading and certification.

Profile summary based on public USPTO records.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

4 Patents

#112 in Santa Ana, CA

#14,041 in California

#60,597 in US

Santa Ana, CA, United States of America

Professional Coin Grading Service, Inc.

Forward Citations = 106

3 inventors:

David E Hall (2 out of 63 patents)

Stephen H Mayer (2 out of 2 patents)

Louis M Crain (2 out of 2 patents)

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