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Adjustable fishing jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Auto set bi-directional jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Downhole connector for use with drill string telemetering system

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Downhole fishing jar mechanism

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Fishing tool energizer and polymer energy storage element embodi

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Mechanical directional drilling jar with swivel means

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
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Mechanical drill string jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Mechanical jarring devices for use in drilling

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
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Mechanical well jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Mechanical-hydraulic double-acting drilling jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Multiple blow percussion drill assembly with rapid field mainten

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Remotely adjustable fishing jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Rotary jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Tubular spring slip-joint and jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Well jar incorporating elongate resilient vibration snubbers and

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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