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Process of Producing Prints on Metal.

Description: Patent for a new way to print negatives directly on sensitized metal by dying the print, removing the dye stains, burnishing the "high lights," polishing the dye print and finally lacquering in order to make permanent. This gives the image a bas-relief effect.
Date: July 13, 1920
Creator: Snow, Philo V.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Process for Hardening Copper.

Description: Patent for a process of hardening copper to prevent bending and scaling of the metal. The process involves heating copper to a high temperature (1370 degrees Fahrenheit) and then subjecting it to continual pressure through hammering it until cold.
Date: February 24, 1920
Creator: Beckham, Dewitt T.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Riveting-Machine and the Art of Riveting.

Description: Patent for improving riveting machines "used in the manufacture of leather and similar goods" (lines 12-13) such that "during the riveting operation the end of the rivet is spun and cut off to hold the bur or washer to its work" (lines 16-19).
Date: October 12, 1920
Creator: Shaw, Fred H.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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