UNT Libraries Government Documents Department - 5 Matching Results

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Improvements in Cotton-Gins

Description: Patent for improvement in the Cotton-Gin with moveable brushes. This object is designed to make the brushes on the cotton machine move closer to the saw when they become shortened from constant use. This will improve the quality of the machine like a brand new equipment.
Date: June 22, 1875
Creator: Koehl, William
Item Type: Refine your search to only Patent

Lock.

Description: Patent for a new and improved lock. This design "is to produce a lock and key in which the lock-case has no exterior opening communicating with its wards or works, but is provided with a recess only for supporting the shank or axis of the key, while the only opening for the admission of the key to the interior of the lock, whereby its wards or bolt may be operated or controlled, is upon the interior of the lock-case, so that there is no possibility of introducing . . . picking devices therein, … more
Date: June 30, 1885
Creator: Markham, Thomas W.
Item Type: Refine your search to only Patent

Vertical Steam-Pump.

Description: Patent for improvements in steam-pumps, of which “are adapted to compress a liquefiable gas—such as that of ammonia—to a state of partial liquefaction, the pressure being subsequently removed and the liquefied refrigerating agent expanding through tubes and chambers, and the cooling effect produced by the volatile liquid again assuming its gaseous state is utilized for the absorption of heat.” (Lines 10-17) Illustration is included.
Date: June 23, 1891
Creator: Robinson, Charles H.
Item Type: Refine your search to only Patent

Improvement in Scale-Beams.

Description: Patent for "the movable weight used on scale-beams; and it consists in the construction and arrangement of the weight to slip over the scale-beam, and with a roller, upon which the weight rests or is suspended, in combination with a locking device." (Lines 12-17) Includes instructions and illustrations.
Date: June 29, 1875
Creator: Robinson, William T.
Item Type: Refine your search to only Patent
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