For the Inventor, By the Inventor

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Broomall, PA, United States of America

Pennsylvania Crusher Corporation

USPTO Granted Patents = 14

Trademarks = 35

Forward Citations = 187

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16 inventors (with patents filed for the assignee):

Carl R Graf (6 out of 7 patents)

William F Hahn (4 out of 8 patents)

Anthony W Slikas (2 out of 2 patents)

4. George H Hart (2 out of 2 patents)

5. Joseph P Nigro (2 out of 2 patents)

6. James A Johnson (1 out of 1 patent)

7. Paul R DeVitis (1 out of 1 patent)

8. Bernard H Schonbach (1 out of 5 patents)

9. Edward J Barnabie (1 out of 1 patent)

10. John D Duke, Jr (1 out of 1 patent)

11. Charles S Fleishman (1 out of 1 patent)

12. Harry E Janes (1 out of 1 patent)

13. Daniel C Sautter (1 out of 1 patent)

14. Frank Wallitsch, Jr (1 out of 1 patent)

15. Gregg Gill (1 out of 1 patent)

14 patents: Sort by Forward Citations

1. 6234414 - Apparatus and method for sealing shafts (2001-05-22),

2. 5251826 - Tumbling media mill and control system (1993-10-12),

3. 5076507 - Variable density grinding media (1991-12-31),

4. 5062601 - Mill screen apparatus (1991-11-05),

5. 5062575 - Comminutor with impact, shear and screening sections (1991-11-05),

6. 4367644 - Adjustable die and key assembly (1983-01-11),

7. 4343438 - Ring hammer (1982-08-10),

8. 4162767 - Impacting crusher with variable flow feed distributor (1979-07-31),

9. 4085897 - Crusher-dryer and method of crushing (1978-04-25),

10. 4061279 - High-speed rotating crushing machinery (1977-12-06),

11. 4009834 - Method of operating breaker/crusher (1977-03-01),

12. 3946950 - Material reducer (1976-03-30),

13. 3936004 - Material reducer (1976-02-03),

14. 3931937 - Breaker/crusher (1976-01-13),

Pennsylvania Crusher Corporation is a leader in the design and manufacture of crushing machinery and replacement parts. With more than 100 years of experience, they offer a wide range of size reduction equipment including crushers, granulators, pulverizers, and hammer mills. Their products are used in various industries such as mining, cement, coal, and power generation.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 9 2025

14 Patents

#3 in Broomall, PA

#792 in Pennsylvania

#21,598 in US

#40,882 in the World

Broomall, PA, United States of America

Pennsylvania Crusher Corporation

Forward Citations = 187

16 inventors:

Carl R Graf (6 out of 7 patents)

William F Hahn (4 out of 8 patents)

Anthony W Slikas (2 out of 2 patents)

4. George H Hart (2 out of 2 patents)

5. Joseph P Nigro (2 out of 2 patents)

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