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US Patent: 1,008,261
Process of Hardening Carpenters' Squares and the Like
Hardened Corners Process
Albert A. Harvie - Ottumwa, IA

USPTO Classifications:
148/210, 148/227

Tool Categories:
layout tools : squares : carpenter squares
tool making : making handsaws

Martin Hardsocg - Ottumwa, IA

Nicholls Mfg. Co. - Ottumwa, IA

P. Ackley
T. K. Harlan

Patent Dates:
Applied: Jan. 17, 1910
Granted: Nov. 07, 1911

Patent Pictures: [ 1 | 2 ]
Shaded area indicates hardened area
USPTO pdf tiff
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Local case hardening process by dipping the portion to be hardened in melted cyanid of potassium, but not restricted to that substance, and then removing the item once it reaches the temperature of the melted salt bath. This method is claimed to avoid the problem of warping when carpenter squares are heat treated in their entirety.

Nicholls applied this patent to their 100-R square calling it the HARDENED CORNERS PROCESS.

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