LandOfFree - US Patents - Listing for Wells

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Dantas Sergio Augusto Ferreira

Inventor

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Dao Bach

Inventor

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Daqing Oilfield Company Limited

Corporate Assignee

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Daragan Evgeniy Venediktovich

Inventor

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Darby John Gregory

Inventor

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Darby Lacy B.

Inventor

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Darby Michael Chad

Inventor

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Darby Scott A.

Inventor

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Dardis Richard E.

Inventor

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Darling Bill

Inventor

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Darling Brian

Inventor

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Darling Brian W. E.

Inventor

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Darnborough Eric

Inventor

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Darnell David Trevor

Inventor

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Darnell William J.

Inventor

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Darr Carey D. K.

Inventor

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Darr Russell C.

Inventor

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Dartez Terry R.

Inventor

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Daryl Gregory

Inventor

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Dataline Petroleum Services, Inc.

Corporate Assignee

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