UNT Libraries Government Documents Department - 6 Matching Results

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Internal Pipe-Gripper

Description: Patent for "new and useful Improvements in Internal Pipe-Grippers" (lines 6-7) such as "an improved tool for removing pipes or casings from drilled wells (lines 14-15) including instructions and illustrations.
Date: August 5, 1913
Creator: McConnell, Scott R.
Item Type: Refine your search to only Patent

Railroad-Tie.

Description: Patent for a railroad-tie that improves on a patent granted to John C. Lee (No. 513,792). The improvement that simplifies and makes the tie stronger and uses less materials.
Date: November 5, 1895
Creator: Mansfield, Robert Allen
Item Type: Refine your search to only Patent

Traction Device.

Description: Patent for a traction device to be attached to the wheels of a motor vehicle to provide greater traction than the treads of the wheels. The traction device is meant to attach to and detach from the wheels as needed and to be adjustable to the dimensions of the wheels and their treads.
Date: July 5, 1921
Creator: Houston, Hugh Edward
Item Type: Refine your search to only Patent
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