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Car-Coupling.
Patent for "construction and arrangement of arrow-shaped draw-heads and lever-bars adjustable upon rack-bars for the purpose of raising and lowering the draw-heads" (lines 16-20)including instructions and illustrations.
Date:
April 20, 1880
Creator:
Gray, John D.
System:
The Portal to Texas History
Inner Tube for Pneumatic Tires
Patent for an inner tube for pneumatic tires that has been layered with vulcanized fabric so as to protect from damage. Illustrations included.
Date:
April 20, 1909
Creator:
Culmore, March
System:
The Portal to Texas History
Lubricating Device for Rotary Drills
Patent for improving the lubricating devices for rotary drills, especially the rotatble cutting devices attached to the head of the drill.
Date:
April 20, 1915
Creator:
Hughes, Howard Robard
System:
The Portal to Texas History
Driving Gearing for Motor Vehicles
Patent for a driving mechanism that allows all four wheels of a motor vehicle to be used for traction purposes.
Date:
April 20, 1915
Creator:
Twyford, Robert E.
System:
The Portal to Texas History
Hose-Coupling.
Patent for a coupling device for train pipes used on railroad trains to connect fluid conduits and similar pipes.
Date:
April 20, 1915
Creator:
Hume, John
System:
The Portal to Texas History
Reamer
Patent for the improvement of vertical reamers used in the drilling of wells. Intended to provide a multi-bladed reamer that expands holes more evenly with less parts than previous models.
Date:
April 20, 1915
Creator:
Hughes, Howard R.
System:
The Portal to Texas History
Spear
Patent for a spear that is used to help withdraw or remove pipes that may get stuck in wellbores.
Date:
April 20, 1920
Creator:
Gray, Ellsworth
System:
The Portal to Texas History
Plunger For Deep-Well Pumps
Patent for improved deep well pumps with plungers used to reduce wear and lower the amount of repairs needed
Date:
April 20, 1920
Creator:
Coulson, William J.
System:
The Portal to Texas History