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Cast iron recuperator
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Patent number 4,417,615
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Issue date Nov 29, 1983
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Air Preheater Company, Inc.
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Richard F. Stockman
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B22 - CASTING POWDER METALLURGY
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Cast recuperator tube
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Patent number 4,416,044
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Issue date Nov 22, 1983
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The Air Preheater Company, Inc.
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Richard F. Stockman
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B22 - CASTING POWDER METALLURGY
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2502767
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Patent number 2,502,767
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Issue date Apr 4, 1950
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B22 - CASTING POWDER METALLURGY
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2454819
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Patent number 2,454,819
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Issue date Nov 30, 1948
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B22 - CASTING POWDER METALLURGY
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2452855
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Patent number 2,452,855
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Issue date Nov 2, 1948
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B22 - CASTING POWDER METALLURGY
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2433109
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Patent number 2,433,109
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Issue date Dec 23, 1947
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B22 - CASTING POWDER METALLURGY
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2369067
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Patent number 2,369,067
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Issue date Feb 6, 1945
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B22 - CASTING POWDER METALLURGY
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2284729
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Patent number 2,284,729
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Issue date Jun 2, 1942
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B22 - CASTING POWDER METALLURGY
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2229184
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Patent number 2,229,184
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Issue date Jan 21, 1941
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B22 - CASTING POWDER METALLURGY
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2185381
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Patent number 2,185,381
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Issue date Jan 2, 1940
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2154104
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Patent number 2,154,104
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Issue date Apr 11, 1939
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2002903
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Patent number 2,002,903
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Issue date May 28, 1935
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B22 - CASTING POWDER METALLURGY
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2002904
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Patent number 2,002,904
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Issue date May 28, 1935
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B22 - CASTING POWDER METALLURGY
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1995008
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Patent number 1,995,008
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Issue date Mar 19, 1935
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B22 - CASTING POWDER METALLURGY
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1970760
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Patent number 1,970,760
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Issue date Aug 21, 1934
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B22 - CASTING POWDER METALLURGY
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1935109
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Patent number 1,935,109
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Issue date Nov 14, 1933
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B22 - CASTING POWDER METALLURGY
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1913356
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Patent number 1,913,356
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Issue date Jun 13, 1933
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B22 - CASTING POWDER METALLURGY