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Reduce height dust valve
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Patent number 4,945,949
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Issue date Aug 7, 1990
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Plattco Corporation
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Urgel R. Carpentier
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Dust valve and trap
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Patent number 4,498,492
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Issue date Feb 12, 1985
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Plattsburgh Foundry, Inc.
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Urgel R. Carpentier
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Trap with reduced force opening means
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Patent number 4,480,812
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Issue date Nov 6, 1984
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Plattsburgh Foundry, Inc.
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Urgel R. Carpentier
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Dust trap with removable valve seat
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Patent number 4,307,747
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Issue date Dec 29, 1981
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Urgel R. Carpentier
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...