Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2001-04-27
2010-06-29
Ip, Sikyin (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S577000, C062S064000, C062S065000, C062S121000
Reexamination Certificate
active
07744707
ABSTRACT:
A deep cryogenic tempering process for brake components such as rotors and drums is provided, wherein the unique processing profile is dependent on properties of the specific brake components. The process comprises the steps of placing a brake component at a temperature within a cryogenic processing chamber, cooling the brake component at a descent rate until the brake component temperature is approximately −300° F., maintaining the brake component temperature at −300° F. for a stay time, raising the temperature of the brake component to approximately −300° F. at an ascent rate, maintaining the temperature of the brake component at 300° F. for a post temper time, and lowering the temperature of the brake component to room temperature at a cool down rate.
REFERENCES:
patent: 5447035 (1995-09-01), Workman et al.
patent: 5865913 (1999-02-01), Paulin et al.
Metals Handbook, 1948 Edition, The American Society for Metals, 1948, pp. 613-630.
Ip Sikyin
Keisling Trent C.
Keisling & Pieper PLC
Lowry Meredith K.
Morrison Brian
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