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System for vessel exchange
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Patent number 4,241,902
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Issue date Dec 30, 1980
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Pennsylvania Engineering Corporation
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Howard M. Fisher
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C21 - METALLURGY OF IRON
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3918682
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Patent number 3,918,682
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Issue date Nov 11, 1975
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B22 - CASTING POWDER METALLURGY
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3741407
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Patent number 3,741,407
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Issue date Jun 26, 1973
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B22 - CASTING POWDER METALLURGY
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3718265
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Patent number 3,718,265
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Issue date Feb 27, 1973
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C21 - METALLURGY OF IRON
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3715101
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Patent number 3,715,101
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Issue date Feb 6, 1973
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C21 - METALLURGY OF IRON
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3640503
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Patent number 3,640,503
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Issue date Feb 8, 1972
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C21 - METALLURGY OF IRON
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3603573
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Patent number 3,603,573
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Issue date Sep 7, 1971
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C21 - METALLURGY OF IRON
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3593859
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Patent number 3,593,859
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Issue date Jul 20, 1971
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B60 - VEHICLES IN GENERAL
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3588073
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Patent number 3,588,073
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Issue date Jun 28, 1971
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C21 - METALLURGY OF IRON
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3531005
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Patent number 3,531,005
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Issue date Sep 29, 1970
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C21 - METALLURGY OF IRON
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3504421
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Patent number 3,504,421
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Issue date Apr 7, 1970
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C21 - METALLURGY OF IRON
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3495812
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Patent number 3,495,812
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Issue date Feb 17, 1970
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C21 - METALLURGY OF IRON
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3469832
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Patent number 3,469,832
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Issue date Sep 30, 1969
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C21 - METALLURGY OF IRON
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3441262
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Patent number 3,441,262
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Issue date Apr 29, 1969
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C21 - METALLURGY OF IRON
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3434606
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Patent number 3,434,606
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Issue date Mar 25, 1969
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C21 - METALLURGY OF IRON
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3411764
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Patent number 3,411,764
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Issue date Nov 19, 1968
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C21 - METALLURGY OF IRON
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3396674
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Patent number 3,396,674
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Issue date Aug 13, 1968
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B22 - CASTING POWDER METALLURGY
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3362700
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Patent number 3,362,700
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Issue date Jan 9, 1968
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B22 - CASTING POWDER METALLURGY
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3348834
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Patent number 3,348,834
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Issue date Oct 24, 1967
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C21 - METALLURGY OF IRON
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3312544
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Patent number 3,312,544
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Issue date Apr 4, 1967
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C21 - METALLURGY OF IRON
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3202301
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Patent number 3,202,301
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Issue date Aug 24, 1965
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B66 - HOISTING LIFTING HAULING
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3141916
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Patent number 3,141,916
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Issue date Jul 21, 1964
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C21 - METALLURGY OF IRON