US4148635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature softening resistance of alloy 688 and modified 688 through the addition of Nb
Assignee: Olin Corp
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Filing: 1977-12-05
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Granted: 1979-04-10
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Expires: 1997-12-05
Abstract
Abstract The improved high temperature softening resistance of Alloy 688 and modified 688 is obtained by the addition of niobium to the alloys. These particular alloy systems not only exhibit resistance to high temperature softening, but also exhibit improved stress corrosion and stress relaxation resistance properties. All of these properties are attained without any loss in the high strength properties of the base alloy systems.
Inventors
- 👤 Warren F. Smith, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A copper base alloy which exhibits improved resistance to softening at high temperatures as well as improved stress corrosion and stress relaxation resistance properties, said alloy consisting essentially of from 66 to 80% by weight copper, from 15 to 32.5% by weight zinc, from 1 to 5% by weight aluminum, an element selected from the group consisting of 0.1 to 3% by weight for any of cobalt, titanium and chromium, 0.2 to 5% by weight nickel and 0.2 to 1.5% by weight iron, and from 0.02 to 1% by weight niobium.
Claim 2
Dependent Claim
91 words
A copper base alloy which exhibits improved resistance to softening at high temperatures as well as improved stress corrosion and stress relaxation resistance properties, said alloy consisting essentially of from 66 to 80% by weight copper, from 15 to 32.5% by weight zinc, from 1 to 5% by weight aluminum, an element selected from the group consisting of 0.1 to 3% by weight for any of cobalt, titanium and chromium, 0.2 to 5% by weight nickel and 0.2 to 1.5% by weight iron, and from 0.02 to 1% by weight niobium.
Claim 3
Dependent Claim
21 words
An alloy according to claim 1 wherein said copper is present in an amount ranging from 70 to 76% by weight.
Claim 4
Dependent Claim
21 words
An alloy according to claim 1 wherein said zinc is present in an amount ranging from 19 to 29% by weight.
Claim 5
Dependent Claim
21 words
An alloy according to claim 1 wherein said aluminum is present in an amount ranging from 2 to 4.5% by weight.
Claim 6
Dependent Claim
21 words
An alloy according to claim 1 wherein said cobalt is present in an amount ranging from 0.1 to 1% by weight.
Claim 7
Dependent Claim
25 words
An alloy according to claim 1 wherein any of said titanium and chromium is present in an amount ranging from 0.1 to 1.5% by weight.
Claim 8
Dependent Claim
21 words
An alloy according to claim 1 wherein said nickel is present in an amount ranging from 0.4 to 2% by weight.
Claim 9
Dependent Claim
21 words
An alloy according to claim 1 wherein said iron is present in an amount ranging from 0.2 to 1% by weight.
Claim 10
Dependent Claim
39 words
An alloy according to claim 1 wherein the alloy further includes an addition in an amount ranging from 0.02 to 0.1% by weight of an element selected from the group consisting of arsenic, antimony and phosphorus, or combinations thereof.
Claim 11
Dependent Claim
32 words
A copper base alloy consisting essentially of 70 to 76% by weight copper, 19 to 29% zinc, 2 to 4.5% aluminum, 0.1 to 1% cobalt, and 0.02 to 1% by weight niobium.
Claim 12
Dependent Claim
32 words
A copper base alloy consisting essentially of 70 to 76% by weight copper, 19 to 29% zinc, 2 to 4.5% aluminum, 0.1 to 1% cobalt, and 0.02 to 1% by weight niobium.
References Cited (Backward Citations)
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US2169188A
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US3484307A
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US3544313A
Cited
CA906786A
Cited
US3703367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-09 | 1982-10-09 | 1983-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-09 | 1986-10-09 | 1987-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-09 | 1990-10-09 | 1991-04-10 | $7700.00 | Window Closed / Lapsed |