For the Inventor, By the Inventor

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Calgary, Canada

Universal Skate Sharpener Ltd.

USPTO Granted Patents = 1

Forward Citations = 50

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6 inventors (with patents filed for the assignee):

Frederick N Trofimenkoff (1 out of 10 patents)

David H Weiler (1 out of 3 patents)

Warren Myrfield (1 out of 1 patent)

4. James H Hannaford (1 out of 1 patent)

5. Joseph A Consay (1 out of 3 patents)

6. Donald M Dobie (1 out of 1 patent)

1 patent: Sort by Forward Citations

1. 4235050 - Skate sharpening apparatus (1980-11-25),

Company Badge

USPTO Data Jan 1 1976 - Dec 30 2025

1 Patents

#591 in Calgary

#9,181 in Canada

Calgary, Canada

Universal Skate Sharpener Ltd.

Forward Citations = 50

6 inventors:

Frederick N Trofimenkoff (1 out of 10 patents)

David H Weiler (1 out of 3 patents)

Warren Myrfield (1 out of 1 patent)

4. James H Hannaford (1 out of 1 patent)

5. Joseph A Consay (1 out of 3 patents)

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