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Chester A. Siver
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Suffield, CT, US
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last 30 patents
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Patent Grant
Ball valve with improved valve seat and bonnet assembly
Patent number
5,799,928
Issue date
Sep 1, 1998
Conval Inc.
Chester A. Siver
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Hemispherical ball valve
Patent number
5,531,244
Issue date
Jul 2, 1996
Conval, Inc.
Chester A. Siver
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Half-turn valve
Patent number
4,597,560
Issue date
Jul 1, 1986
Conval, Inc.
Chester A. Siver
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Valve with yoke and captive gland wrench
Patent number
4,351,512
Issue date
Sep 28, 1982
Chester A. Siver
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...