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4 Matching Results
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Refrigerator
Patent for improvements for vacuum refrigerators such that cold air circulation and heat exclusion are improved, including illustrations.
Date:
June 27, 1922
Creator:
Knutson, William K.
System:
The Portal to Texas History
Boring and Threading Tool.
Patent for an inexpensive, efficient boring and threading tool that "will enable a smooth and even surface to be produced with a minimum of skill on the part of the operator" (lines 18-21).
Date:
June 21, 1921
Creator:
Wells, Daniel Doolittle
System:
The Portal to Texas History
Pipe Tongs.
Patent for pipe tongs for drilling wells using rotary systems. The tongs are designed to be securely held against the drill stem using a lever, making them simple and economical to manufacture.
Date:
June 28, 1921
Creator:
Hill, Richard D.
System:
The Portal to Texas History
Baby Net Frame.
Patent for a frame that can support a baby net and can be collapsed for easy storage. The frame also features components that prevent collapse and provide stability when in use.
Date:
June 6, 1922
Creator:
Akers, Blessie E.
System:
The Portal to Texas History