% Expired Patents = 66.7

Forward Citations = 86

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3 inventors (with patents filed for the assignee):

Henry B Mazorow (3 out of 6 patents)

Paris E Blair (2 out of 8 patents)

Chris Sanfelice (2 out of 2 patents)

3 patents: Sort by Forward Citations

1. 6964303 - Horizontal directional drilling in wells (2005-11-15),

2. 6889781 - Horizontal directional drilling in wells (2005-05-10),

3. 6578636 - Horizontal directional drilling in wells (2003-06-17),

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

3 Patents

#11 in Lorain, OH

#2,864 in Ohio

#73,904 in US

Lorain, OH, United States of America

Performance Research & Drilling, LLC

Forward Citations = 86

3 inventors:

Henry B Mazorow (3 out of 6 patents)

Paris E Blair (2 out of 8 patents)

Chris Sanfelice (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Performance Research & Drilling, LLC. Retrieved from https://idiyas.com/company/performance-research-and-drilling

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]