Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2007-01-16
2007-01-16
King, Roy (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S578000
Reexamination Certificate
active
10783932
ABSTRACT:
The thermal process for treating a metal to improve structural characteristics of the metal entails placing a metal within a thermal control apparatus; introducing a cryogenic material into the thermal control apparatus to decrease the metal temperature, while preventing over-stressing of the metal, to a first target temperature ranging from −40 degrees F. and −380 degrees F. at a first temperature rate ranging from 0.25 degrees per minute and 20 degrees per minute; stopping the introduction of the cryogenic material once the first target temperature is reached; increasing the chamber temperature to a second target, temperature ranging from 0 degrees F. and 1400 degrees F.; and increasing the metal temperature to the second target temperature at a second temperature rate ranging from 0.25 degrees per minute and 20 degrees per minute, resulting in a treated metal without fractures.
REFERENCES:
patent: 6544669 (2003-04-01), Groll
William E. Bryson, Cryogenics, 1999, Hanser Gardner Publications, pp. 29, 40, 49-52, 65-75.
Weisend, Handbook of Cryogenic Engineering, May 6, 1999, Taylor & Francis, 413-428.
Buskop Wendy
Buskop Law Group PC
Watson Daniel
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