For the Inventor, By the Inventor

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Canton, OH, United States of America

Aspro, Incorporated

USPTO Granted Patents = 33

Trademarks = 1

Forward Citations = 409

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14 inventors (with patents filed for the assignee):

Derald H Kraft (10 out of 20 patents)

Richard C St John (9 out of 18 patents)

Nolte V Sproul (4 out of 8 patents)

4. William C Eddy (3 out of 3 patents)

5. Albert F Myers, Sr (2 out of 2 patents)

6. Walter L Dissett (1 out of 17 patents)

7. Gary Bernard Schumacher (1 out of 2 patents)

8. Carmeli Adahan (1 out of 3 patents)

9. Michael F Kark (1 out of 1 patent)

10. John D Danko (1 out of 1 patent)

11. Thomas A Devlin (1 out of 1 patent)

12. Jeffrey D Marsh (1 out of 1 patent)

13. Larry L Stoner (1 out of 1 patent)

14. Gary B Schumacher (1 out of 1 patent)

Core Competencies:

Centrifugal Clutch

Brake Pressure Modulator

Traction Control

Sintered Pulley

Parking Brake

V-Grooved Pulleys

Anti-Skid System

Limited Slip Differential

Quick Release Clutch

Noise-Dampened Construction

Speed-Responsive Control

Multi-Shell Differential

33 patents: Sort by Forward Citations

1. 4282962 - Pivotal mounting assembly (1981-08-11),

2. 4254541 - Method of making clutch housing and pulley assembly (1981-03-10),

3. 4226320 - Centrifugal clutch construction (1980-10-07),

4. 4192412 - Centrifugal clutch with shoe stops (1980-03-11),

5. 4156547 - Speed-responsive anti-skid and anti-spin system for vehicles (1979-05-29),

6. 4141430 - Speed-responsive tag axle control system (1979-02-27),

7. 4109542 - Spun V-grooved sheet metal pulley with thick hub wall integral with thin (1978-08-29),

8. 4090284 - Method of making a sintered pulley hub construction (1978-05-23),

9. 4066300 - Digital traction control system (1978-01-03),

10. 4062433 - Quick release centrifugal clutch construction (1977-12-13),

11. 4059023 - One-piece sintered pulley hub construction (1977-11-22),

12. 4056291 - Clutch housing and bearing assembly and method of making the same (1977-11-01),

13. 4056014 - Sintered pulley hub construction and method of making same (1977-11-01),

14. 4055976 - Method of roller spinning cup-shaped metal blanks and roller (1977-11-01),

15. 4050321 - Multi V-grooved pulley structure and method of making same (1977-09-27),

Company Overview

Aspro, Incorporated, based in Canton, Ohio, specializes in the development and manufacturing of advanced materials and innovative solutions for various industries. The company focuses on enhancing product performance through cutting-edge technology and research, particularly in the fields of coatings, adhesives, and sealants. With a commitment to quality and sustainability, Aspro aims to meet the evolving needs of its clients while contributing to advancements in material science and engineering.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

33 Patents

#6 in Canton, OH

#454 in Ohio

#10,309 in US

#20,162 in the World

Canton, OH, United States of America

Aspro, Incorporated

Forward Citations = 409

14 inventors:

Derald H Kraft (10 out of 20 patents)

Richard C St John (9 out of 18 patents)

Nolte V Sproul (4 out of 8 patents)

4. William C Eddy (3 out of 3 patents)

5. Albert F Myers, Sr (2 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Aspro, Incorporated. Retrieved from https://idiyas.com/company/aspro

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]

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