US4139378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder-metallurgy of cobalt containing brass alloys
Assignee: Manufacturers Hanover Trust Co
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Filing: 1977-10-28
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Granted: 1979-02-13
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Expires: 1997-10-28
Abstract
Abstract The properties of brass powder compacts are improved by including selected amounts of cobalt in the brass powder compositions; specifically brass powder compacts broadly comprising about 5% to about 45% zinc, about 1% to about 7% cobalt, balance essentially copper, are disclosed.
Inventors
- 👤 Richard S. Bankowski
- 👤 Kermit E. Geary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:02
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/0425
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
A sintered brass compact containing cobalt and exhibiting substantially decreased shrinkage upon sintering in the order of at least about 40% improvement as compared to a comparable non-cobalt containing brass compact, and formed from a powder composition consisting essentially of about 25% to about 45% zinc, about 2% to about 7% cobalt, the balance being essentially copper.
Claim 2
Dependent Claim
57 words
A sintered brass compact containing cobalt and exhibiting substantially decreased shrinkage upon sintering in the order of at least about 40% improvement as compared to a comparable non-cobalt containing brass compact, and formed from a powder composition consisting essentially of about 25% to about 45% zinc, about 2% to about 7% cobalt, the balance being essentially copper.
Claim 3
Dependent Claim
29 words
A sintered brass compact as defined in claim 1 containing zinc in amounts of about 25% to about 35%, and cobalt in amount of about 2% to about 5%.
Claim 4
Dependent Claim
29 words
A sintered brass compact as defined in claim 1 containing zinc in amounts of about 26.8% to about 29.4%, and cobalt in amounts of about 2% to about 3.8%.
Claim 5
Dependent Claim
20 words
A sintered brass compact as defined in claim 3 containing cobalt in an amount of about 2.9% to about 3.8%.
Claim 6
Dependent Claim
17 words
A sintered brass compact as defined in claim 4 containing cobalt in an amount of about 3.4%.
Claim 7
Dependent Claim
29 words
A sintered brass compact as defined in claim 1 containing zinc in amounts of about 35% to about 45%, and cobalt in amounts of about 2% to about 7%.
Claim 8
Dependent Claim
20 words
A sintered brass compact as defined in claim 6 containing cobalt in an amount of about 3% to about 7%.
Claim 9
Dependent Claim
29 words
A sintered brass compact as defined in claim 1 containing zinc in amounts of about 32% to about 38.2%, and cobalt in amounts of about 2% to about 5.7%.
Claim 10
Dependent Claim
17 words
A sintered brass compact as defined in claim 16 containing cobalt in an amount of about 4.95%.
Claim 11
Dependent Claim
19 words
A sintered brass compact as defined in claim 1 containing lead in an amount of up to about 2%.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |