LandOfFree - US Patents - Listing for Wells,Processes,Placing or shifting well part

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Ditta Frank

Inventor

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Divis Robert

Inventor

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Doane James Christopher

Inventor

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Dolyniuk David A.

Inventor

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Donnell Ben A.

Inventor

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Donnelly Martin

Inventor

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Dowell, a division of Schlumber Technology Corporation

Corporate Assignee

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Drakeley Brian Keith

Inventor

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Dril—Quip, Inc.

Corporate Assignee

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Drummond Steven J.

Inventor

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Du Michael Hui

Inventor

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Dual Gradient Systems, L.L.C.

Corporate Assignee

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Duell Alan B.

Inventor

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Duff Richard

Inventor

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Duguid David

Inventor

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Duke Wesley G.

Inventor

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Dunbar Mark Edward

Inventor

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Duncan George C.

Inventor

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Dunlap Kenneth S.

Inventor

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Dynamic Oil Tools Inc.

Corporate Assignee

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