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Drill.

Description: Patent for a simple, durable, and effective drill that "automatically expand[s] in the bottom of the well below the tubing, to cut a hole sufficiently large for the tubing without requiring a second drilling or reaming process" (lines 11-15).
Date: September 25, 1894
Creator: Lindholm, Charlie M.
Item Type: Refine your search to only Patent

Drill.

Description: Patent for an earth-boring drill with an improved means for keeping the drill centered at all times in order to drill in a straight path.
Date: March 9, 1915
Creator: Weathersby, Fred Richard
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Drill.

Description: Patent for a drill especially adapted for use in rock and earth formations. The drill has a number of separate cutters that are secured onto a head and detachable, which gives the tool many advantages.
Date: November 4, 1913
Creator: Weathersby, Fred Richard
Item Type: Refine your search to only Patent

Drill.

Description: Patent for modified drill bit to improve "boring through rocks or other hard substances." (lines 10-11) including illustrations.
Date: May 8, 1917
Creator: Hensley, Sewell S.
Item Type: Refine your search to only Patent

Drill.

Description: Patent for an improvement to drills. Side cutters have been added onto the drill head that extend farther from the head than the cutter underneath. This gradually enlarges the bore and allows for lubrication of bearings and water can be used to flush out the bore while digging.
Date: August 31, 1915
Creator: Decker, Harry R.
Item Type: Refine your search to only Patent

Drill.

Description: Patent for improvements in drills by providing “a frame which may be readily attached to any suitable support and wherein the drill-spindle may be engaged for operation by a common form of chest-brace.” (Lines 9-13) The frame would enable the stock-rest to adjust in proper positions to receive different thicknesses of stock.” (Lines 15-17) Illustration is included.
Date: April 2, 1901
Creator: Willmann, Joseph
Item Type: Refine your search to only Patent

Drill Bit

Description: Patent for improvements in drill bits, particularly in the application used in drilling in soft formations, such as clay, gumbo, or similar material. The purpose of the invention is to provide a way to prevent the sticking of material to the drill and drill collar while the drilling operation is being performed.
Date: February 14, 1922
Creator: Childs, William L.
Item Type: Refine your search to only Patent

Drill Bit

Description: Patent for drill bit, adapted for use in boring (or drilling) of oil wells with bit shank and enlarged head of angularly mounted rotary cutters (for outward cutting of well walls).
Date: January 3, 1922
Creator: Thomas, Martin E.
Item Type: Refine your search to only Patent

Drill-Bit.

Description: Patent for improvement to drill-bits. The object of the invention is to provide a bit of the character described which is especially adapted for deep well drilling by the rotary process.
Date: December 30, 1919
Creator: Humason, Granville A.
Item Type: Refine your search to only Patent

Drill-Bit.

Description: Patent for improvements in drill bit constructions that allows the drill bit to be switched out and the new bit locked in so it is secure.
Date: June 22, 1920
Creator: Midgett, Penelton G.
Item Type: Refine your search to only Patent

Drill-Bit

Description: Patent for a drill bit for oil wells that provides a way for the bit to be lubricated while in use to prevent the adhesion of gummy substances.
Date: June 4, 1918
Creator: Kilgore, John G.
Item Type: Refine your search to only Patent

Drill-Bit

Description: Patent for new improvement in drill-bits. The object of the invention is to "provide the driller with advanced knowledge of the formation into which he is about to extend his main hole".
Date: January 11, 1921
Creator: Smith, Primus W.; Bookhout, John J. & Monce, Edwin W.
Item Type: Refine your search to only Patent

Drill Bit

Description: Patent for a drill bit that can pass through the drill stem, making the process of drilling faster and easier.
Date: February 24, 1920
Creator: Clements, Frank L., Jr.
Item Type: Refine your search to only Patent

Drill-Bit

Description: Patent for an improved kind of drill bit that is more durable against rock. The bit's cutting rollers have a frusto-conical shape, and are also detachable.
Date: January 24, 1919
Creator: Humason, Granville A.
Item Type: Refine your search to only Patent

Drill-Bit

Description: Patent for Drill-Bit that is especially designed for purpose of drilling through rock, or other hard formations and is also adapted for use in drilling through softer formation, such as shell.
Date: June 10, 1919
Creator: Culmore, March J. A.
Item Type: Refine your search to only Patent
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