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Copper Cliff, Canada

Hdrk Mining Research Limited

USPTO Granted Patents = 3

Forward Citations = 62

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13 inventors (with patents filed for the assignee):

Wilfried Piefenbrink (2 out of 2 patents)

David Bruce Rhodes (1 out of 6 patents)

Michel J Pettigrew (1 out of 1 patent)

4. Victor A Mason (1 out of 4 patents)

5. Eric G Lux (1 out of 1 patent)

6. Hermann Hamburger (1 out of 1 patent)

7. Walter Weber (1 out of 1 patent)

8. Werner Hensgens (1 out of 1 patent)

9. Peter Heinrich Hennecke (1 out of 1 patent)

10. Guy Chevrette (1 out of 1 patent)

11. Everett James Henderson (1 out of 1 patent)

12. Jacques Andre Saint-Pierre (1 out of 1 patent)

13. Jeffrey Nicholas Repski (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 5938288 - Automatic control system and method for a machine used for excavating (1999-08-17),

2. 5340199 - Method and machine for excavating drifts, tunnels, stopes, caverns or (1994-08-23),

3. 5024090 - Loose rock detector (1991-06-18),

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USPTO Data Jan 1 1976 - Dec 16 2025

3 Patents

#2 in Copper Cliff

#4,243 in Canada

Copper Cliff, Canada

Hdrk Mining Research Limited

Forward Citations = 62

13 inventors:

Wilfried Piefenbrink (2 out of 2 patents)

David Bruce Rhodes (1 out of 6 patents)

Michel J Pettigrew (1 out of 1 patent)

4. Victor A Mason (1 out of 4 patents)

5. Eric G Lux (1 out of 1 patent)

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