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Ring seal packer
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Patent number 5,303,774
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Issue date Apr 19, 1994
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Duhn Oil Tool, Inc.
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Jay C. Duhn
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E21 - EARTH DRILLING MINING
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Sand pan
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Patent number 5,176,838
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Issue date Jan 5, 1993
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Shell Western E&P Inc.
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Robert W. Chin
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
-
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Sucker rod pump
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Patent number 5,108,272
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Issue date Apr 28, 1992
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Shell Western E&P Inc.
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James R. Brewer
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E21 - EARTH DRILLING MINING
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Sucker rod pump
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Patent number 5,104,301
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Issue date Apr 14, 1992
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Shell Western E&P Inc.
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James R. Brewer
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E21 - EARTH DRILLING MINING
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-
-
-
-
-
-
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Retractable towing shackle
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Patent number 4,788,927
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Issue date Dec 6, 1988
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Shell Western E&P, Inc.
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James M. Casey
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B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT
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Pipelay in slurry trench
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Patent number 4,714,379
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Issue date Dec 22, 1987
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Shell Western E&P Inc.
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Robert T. Gilchrist
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Turbine cooling waxy oil
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Patent number 4,702,758
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Issue date Oct 27, 1987
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Shell Western E&P Inc.
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Julia S. Geer
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Choke cooling waxy oil
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Patent number 4,697,426
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Issue date Oct 6, 1987
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Shell Western E&P Inc.
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William T. Knowles
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F17 - STORING OF DISTRIBUTING GASES OR LIQUIDS
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Fireproof boom
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Patent number 4,645,376
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Issue date Feb 24, 1987
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Shell Western E&P Inc.
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Wayne F. Simpson
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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-
-
-
Fireproof boom
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Patent number 4,599,013
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Issue date Jul 8, 1986
-
Shell Western E&P Inc.
-
Wayne F. Simpson
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING