4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element

Percy W. Schumacher, Jr.

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Combination drag and roller cutter drill bit

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Drill bit

Cutlery
Patent

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Drill bit having offset roller cutters and improved nozzles

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Intermittent high-drag oil well drilling bit

Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent

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Rolling cutter drill bit

Metal tools and implements – making – Blank or process – Drill
Patent

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Profile ID: LFUS-PAI-P-233483

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