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Widnau, Switzerland

Plaston Ag, Kunststoffwerke Hans Frei & Sohne

USPTO Granted Patents = 1

Forward Citations = 13

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4 inventors (with patents filed for the assignee):

Franz Gutmann (1 out of 3 patents)

Roland Frei (1 out of 2 patents)

Peter Koeppel (1 out of 1 patent)

4. Peter Sieber (1 out of 2 patents)

1 patent: Sort by Forward Citations

1. 4123228 - Filters for liquids (1978-10-31),

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USPTO Data Jan 1 1976 - Dec 16 2025

1 Patents

#9 in Widnau

#4,650 in Switzerland

Widnau, Switzerland

Plaston Ag, Kunststoffwerke Hans Frei & Sohne

Forward Citations = 13

4 inventors:

Franz Gutmann (1 out of 3 patents)

Roland Frei (1 out of 2 patents)

Peter Koeppel (1 out of 1 patent)

4. Peter Sieber (1 out of 2 patents)

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