Cryogenically-treated electrical contacts

Details Cryogenically-treated electrical contacts Cryogenically-treated electrical contacts

1993-07-22

1995-08-22

Capossela, Ronald C.

Refrigeration

Processes

Treating an article

622592, 29622, 29825, 29877, 200268, F25D 2500

Patent

active

054429293

ABSTRACT:
The useful life of electrical contacts is extended by a cryogenic treatment. An electrical contact is exposed to a low temperature, such as below 172 K for a selected period of time. The low temperature may be obtained via a controlled rate of cooling. After the contact has been exposed to the low temperature, the contact may be returned to ambient temperature at a controlled rate. The cryogenic treatment results in extended useful life of contacts made of materials such as copper and of composite contacts incorporating silver, refractory metals, and metal oxides such as cadmium oxide and tin oxide.

REFERENCES:
patent: 4777804 (1988-10-01), Bowling et al.
patent: 4872322 (1989-10-01), Woods et al.
patent: 4874430 (1989-10-01), Bornstein
patent: 5174122 (1992-12-01), Levine
"Deep Freeze Promises Violin Strings New Life," Boston Herald, Nov. 29, 1988.
"Out in the Cold," Omni, Mar. 1989, p. 40.
"Cold Strings Warm Music's Tones," The Worcester [Mass.] Evening Gazette, Feb. 21, 1989, p. D5.
"Using Process Controls for Cryogenic Accuracy," Heat Treating, Jul. 1991, p. 19.
"Frozen Tools," Popular Science, vol. 230, No. 6, Jun. 1987, p. 64.
Museatex Cryogenics Inc., Montreal Canada, advertisement brochure (3 sheets).
"The CP-100 Cryoprocessor From Applied Cryogenics Inc.," Applied Cryogenics Inc., Newton, Mass. (3 sheets).
"Extended Life for Tooling and Wear Parts," Applied Cryogenics Inc., Newton, Mass. (4 sheets).

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