For the Inventor, By the Inventor

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Hedemora, Sweden

Hedemora Ab

USPTO Granted Patents = 3

CIPO Patents = 1

Forward Citations = 78

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5 inventors (with patents filed for the assignee):

Bertil Pettersson (1 out of 4 patents)

Edvin Frisk (1 out of 1 patent)

Arne Lindahl (1 out of 1 patent)

4. Per-Olof Frisk (1 out of 1 patent)

5. Torsten L Berggren (1 out of 5 patents)

6. Kent Strid (0 patent)

3 patents: Sort by Forward Citations

1. 4997578 - Method and apparatus for dewatering and squeezing material (1991-03-05),

2. 4941945 - Method for clarifying green liquor (1990-07-17),

3. 4908101 - Method and apparatus for mixing chemicals into fiber pulp (1990-03-13),

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USPTO Data Jan 1 1976 - Jan 13 2026

3 Patents

#2 in Hedemora

#1,563 in Sweden

Hedemora, Sweden

Hedemora Ab

Forward Citations = 78

5 inventors:

Bertil Pettersson (1 out of 4 patents)

Edvin Frisk (1 out of 1 patent)

Arne Lindahl (1 out of 1 patent)

4. Per-Olof Frisk (1 out of 1 patent)

5. Torsten L Berggren (1 out of 5 patents)

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