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Patent applications and USPTO patent grants for Persson; Bengt Arne.The latest application filed is for "air valve having an annular movable valve element of elastomeric material".
Patent | Date |
---|---|
Air valve having an annular movable valve element of elastomeric material Grant 3,923,081 - Persson December 2, 1 | 1975-12-02 |
Valve device for restricting the flow of a liquid by a helical flow passage Grant 3,907,249 - Persson September 23, 1 | 1975-09-23 |
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