Which inventor is associated with the patent for the two-cone roller-cone bit in 1909?

Which inventor is associated with the patent for the two-cone roller-cone bit in 1909?

• A. Thomas Edison
• B. Nikola Tesla
• C. Henry Ford
• D. Howard Hughes

Answer: (D)

The idea being tested is who first patented the two-cone roller-cone drill bit and why that invention mattered. This bit uses two conical rollers with teeth that rotate as the drill advances, breaking and grinding rock more efficiently than earlier fixed-cutters. That rolling action reduces wear and helps prevent stuck bits, enabling faster, deeper drilling in hard formations. Howard Hughes Sr., founder of Hughes Tool Company, is credited with the 1909 patent for the two-cone roller-cone drill bit. His design became a foundational technology in oilfield drilling and shaped how later bits were developed and used for decades. The other names listed are famous for breakthroughs in electricity, electromagnetism, and mass production, not for drill-bit technology, so they don’t align with this patent context.

The idea being tested is who first patented the two-cone roller-cone drill bit and why that invention mattered. This bit uses two conical rollers with teeth that rotate as the drill advances, breaking and grinding rock more efficiently than earlier fixed-cutters. That rolling action reduces wear and helps prevent stuck bits, enabling faster, deeper drilling in hard formations.

Howard Hughes Sr., founder of Hughes Tool Company, is credited with the 1909 patent for the two-cone roller-cone drill bit. His design became a foundational technology in oilfield drilling and shaped how later bits were developed and used for decades.

The other names listed are famous for breakthroughs in electricity, electromagnetism, and mass production, not for drill-bit technology, so they don’t align with this patent context.