US4180398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of leaded brasses to improve hot workability
Assignee: Olin Corp
•
Filing: 1978-06-22
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Granted: 1979-12-25
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Expires: 1998-06-22
Abstract
Abstract Leaded brasses are modified by additions of chromium, antimony and bismuth in order to reduce the susceptibility of the brasses to edge cracking during hot working. The additional alloying elements also help to maintain the widely known good machinability characteristics of the leaded brasses.
Inventors
- 👤 Prakash D. Parikh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:38
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
49 words
An alloy which exhibits high resistance to edge cracking during hot working, said alloy consisting essentially of 10 to 40% by weight zinc, 0.1 to 5% by weight lead, 0.03 to 0.75% by weight chromium, 0.005 to 0.05% by weight antimony, 0.005 to 0.05% by weight bismuth, balance copper.
Claim 2
Dependent Claim
49 words
An alloy which exhibits high resistance to edge cracking during hot working, said alloy consisting essentially of 10 to 40% by weight zinc, 0.1 to 5% by weight lead, 0.03 to 0.75% by weight chromium, 0.005 to 0.05% by weight antimony, 0.005 to 0.05% by weight bismuth, balance copper.
Claim 3
Dependent Claim
44 words
An alloy according to claim 1, wherein said alloy consists essentially of 30 to 40% by weight zinc, 0.5 to 3% by weight lead, 0.05 to 0.25% by weight chromium, 0.005 to 0.025% by weight antimony, 0.005 to 0.025% by weight bismuth, balance copper.
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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) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |