3 Matching Results
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Aeroplane
Patent for an aeroplane that is inexpensive and easily built, while preventing the aeroplane from going into a tailspin.
Date:
December 13, 1921
Creator:
{McGee, Dan}
System:
The Portal to Texas History
Rotary Engine
Patent for rotary engine, with improvements to rotary engine fluid pressure for motors or engines which pump fluids (such as water motor, water pump, oil pump, ammonia pump or compressor).
Date:
December 27, 1921
Creator:
Johnson, Louis V.
System:
The Portal to Texas History
Mold for Making Fan-Belts.
Patent for a three-piece mold which allows for fan belts to be made using a single piece of rubber or composition material. The fan belts would primarily be used in motor vehicles.
Date:
December 27, 1921
Creator:
Hibbs, Cassell D.
System:
The Portal to Texas History