3 Matching Results
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Clothespin
Patent for an improved version of the clothespin, which is simple to use, durable, and cheap to manufacture.
Date:
March 21, 1922
Creator:
Ingersoll, Charles James
System:
The Portal to Texas History
Hydraulic Classifier.
Patent for hydraulic classifier for the treatment of ore. The invention subjects settling solid particles to a secondary classification and prevent the contamination of the settling solids before they are discharged.
Date:
March 21, 1922
Creator:
Allen, Charles
System:
The Portal to Texas History
Ice-Holding Device.
Patent for a device to hold ice upon running-boards of vehicles (lines 10-11.) This device is flexible in use (it can be pulled up to reveal the ice, and put back out of the way), simple in design, and cheap to construct.
Date:
March 21, 1922
Creator:
Barton, Warren D.
System:
The Portal to Texas History