US3880678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing copper base alloy
Assignee: Olin Corp
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Filing: 1974-03-27
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Granted: 1975-04-29
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Expires: 1994-03-27
Abstract
Abstract A method of improving the stress corrosion resistance of a stress corrosion susceptible copper base alloy. A formed part of said copper base alloy is subjected to a low temperature thermal treatment under specified conditions.
Inventors
- 👤 Stanley Shapiro
- 👤 Derek E Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:26
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A METHOD OF IMPROVING THE STRESS CORROSION RESISTANCE OF A STRESS CORROSION SUSCEPTIBLE COPPER BASE ALLOY WITHOUT SUBSTANTIAL DEGRADATION OF DESIRABLE MECHANICAL PROPERTIES, SAID COPPER BASE ALLOY CONSISTING ESSENTIALLY OF FROM 5 TO 20 PER CENT MANGANESE, FROM 15 TO 35 PERCENT ZINC, BALANCE COPPER WHICH COMPRISES: PROVIDING SAID ALLOY IN THE WROUGHT CONDITION, FINALLY FORMING SAID ALOY INTO A DESIRED SHAPE, AND HEAT TREATING SAID FINALLY FORMED ALLOY AT A TEMPERATURE OF FROM 300* TO 385*C FOR FROM 15 MINUTES TO 4 HOURS, WITH NO FURTHER FORMING OPERATIONS BEING PERFORMED AFTER SAID HEAT TREATMENT STEP.
Claim 2
Independent Claim
96 words
A METHOD OF IMPROVING THE STRESS CORROSION RESISTANCE OF A STRESS CORROSION SUSCEPTIBLE COPPER BASE ALLOY WITHOUT SUBSTANTIAL DEGRADATION OF DESIRABLE MECHANICAL PROPERTIES, SAID COPPER BASE ALLOY CONSISTING ESSENTIALLY OF FROM 5 TO 20 PER CENT MANGANESE, FROM 15 TO 35 PERCENT ZINC, BALANCE COPPER WHICH COMPRISES: PROVIDING SAID ALLOY IN THE WROUGHT CONDITION, FINALLY FORMING SAID ALOY INTO A DESIRED SHAPE, AND HEAT TREATING SAID FINALLY FORMED ALLOY AT A TEMPERATURE OF FROM 300* TO 385*C FOR FROM 15 MINUTES TO 4 HOURS, WITH NO FURTHER FORMING OPERATIONS BEING PERFORMED AFTER SAID HEAT TREATMENT STEP.
Claim 3
Dependent Claim
27 words
A method according to claim 1 wherein said alloy is heat treated at a temperature of from 310* to 360*C for from 30 minutes to 2 hours.
Claim 4
Dependent Claim
16 words
A method according to claim 1 wherein said alloy is provided in the cold rolled condition.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein said alloy is provided in the cold rolled and annealed condition.
Claim 6
Dependent Claim
16 words
A method according to claim 1 wherein said alloy contains from 0.5 to 5 percent nickel.
Claim 7
Dependent Claim
34 words
A method according to claim 1 wherein said alloy contains less than 0.5 percent each of a material selected from the group consisting of aluminum, iron, tin, silicon, cobalt, magnesium, molybdenum and mixtures thereof.
Claim 8
Dependent Claim
30 words
A method according to claim 1 wherein said alloy contains less than 0.3 percent each of a material selected from the group consisting of phosphorus, arsenic, antimony and mixtures thereof.
Claim 9
Dependent Claim
16 words
A method according to claim 1 wherein said copper alloy contains up to 3 percent lead.
References Cited (Backward Citations)
US1706198A
Cited
US3778236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |