% Expired Patents = 20.0

Forward Citations = 76

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6 inventors (with patents filed for the assignee):

Roger A Webel (2 out of 3 patents)

Salvatore L Zingales, Sr (1 out of 1 patent)

Jack T Anderson (1 out of 2 patents)

4. Robert L Truelsch (1 out of 1 patent)

5. Kevin M Kunzman (1 out of 1 patent)

6. Ron R Karani (1 out of 3 patents)

5 patents: Sort by Forward Citations

1. 6491114 - Slow start control for a hydraulic hammer (2002-12-10),

2. 6385870 - Control system for an excavator thumb and a method of controlling an excavator thumb (2002-05-14),

3. 5542180 - Heavy duty shear with anti-jam feature (1996-08-06),

4. 5230151 - Heavy duty shear head and mounting support (1993-07-27),

5. 4906049 - Ripper using a hydraulic hammer and a method for making the improvement (1990-03-06),

Company Overview

Npk Construction Equipment, Inc. is a leading manufacturer of construction equipment known for its high quality and durability. With over 35 years of experience, Npk offers a wide range of products including hydraulic hammers, compactors, and crushers. Their commitment to excellence and innovation has made them a trusted name in the industry.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

5 Patents

#1 in Walton Hills, OH

#2,004 in Ohio

#51,644 in US

Walton Hills, OH, United States of America

Npk Construction Equipment, Inc.

Forward Citations = 76

6 inventors:

Roger A Webel (2 out of 3 patents)

Salvatore L Zingales, Sr (1 out of 1 patent)

Jack T Anderson (1 out of 2 patents)

4. Robert L Truelsch (1 out of 1 patent)

5. Kevin M Kunzman (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Npk Construction Equipment, Inc.. Retrieved from https://idiyas.com/company/npk-construction-equipment

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]