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Helinski, Finland

Oy Kolster Ab

USPTO Granted Patents = 3

Forward Citations = 28

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7 inventors (with patents filed for the assignee):

Martti Karppinen (1 out of 4 patents)

Olavi A Ebeling (1 out of 6 patents)

Esko Sohlo (1 out of 1 patent)

4. Jarmo Karvonen (1 out of 1 patent)

5. Matti Otala (1 out of 1 patent)

6. Paavo Huttunen (1 out of 1 patent)

7. Launo Laakkonen (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 5522197 - Method in connection with a roof drainage apparatus and a roof drainage (1996-06-04),

2. 4304995 - Method and apparatus for measuring the wall thickness in a plastic (1981-12-08),

3. D261925 - Over-pressure valve for ventilation (1981-11-17),

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USPTO Data Jan 1 1976 - Dec 16 2025

3 Patents

#1 in Helinski

#770 in Finland

Helinski, Finland

Oy Kolster Ab

Forward Citations = 28

7 inventors:

Martti Karppinen (1 out of 4 patents)

Olavi A Ebeling (1 out of 6 patents)

Esko Sohlo (1 out of 1 patent)

4. Jarmo Karvonen (1 out of 1 patent)

5. Matti Otala (1 out of 1 patent)

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