US4113474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper alloys of excellent corrosion resistance, moldability and workability
Assignee: Toyo Valve Co Ltd
•
Filing: 1976-06-23
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Granted: 1978-09-12
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Expires: 1996-06-23
Abstract
Abstract Copper alloys which excel in corrosion resistance, moldability and workability and are particularly suitable for use as materials for valves, cocks, elbows, tees, etc. or cast parts associated therewith. One copper alloy comprising by weight 27.0 - 32.0% zinc, 0.8 - 4.0% lead, 0.2 - 0.8% silicon, 0.1 - 2.0% manganese, 0.01 - 0.1% arsenic and 0.03 - 0.4% aluminum the rest being composed of copper; and the other copper alloy comprising by weight 27.0 - 32.0% zinc, 0.8 - 4.0% lead, 0.2 - 0.8% silicon, 0.1 - 2.0 manganese, 0.01 - 0.1% arsenic, 0.03 - 0.4% aluminum and 0.01 - 1.0% tin the rest being composed of copper.
Inventors
- 👤 Masao Okano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:23
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A copper alloy which is composed of 27.0-32.0 wt % zinc, 0.8-4.0 wt % lead, 0.2-0.8 wt % silicon, 0.1-2.0 wt % manganese, 0.01-0.1 wt % arsenic, 0.03-0.4 wt % aluminum, 0.01-1.0 wt % tin, the remainder being copper.
Claim 2
Dependent Claim
39 words
A copper alloy which is composed of 27.0-32.0 wt % zinc, 0.8-4.0 wt % lead, 0.2-0.8 wt % silicon, 0.1-2.0 wt % manganese, 0.01-0.1 wt % arsenic, 0.03-0.4 wt % aluminum, 0.01-1.0 wt % tin, the remainder being copper.
Claim 3
Dependent Claim
18 words
The copper alloy of claim 1 wherein the aluminum is present in an amount of 0.03-0.35 wt %.
Claim 4
Dependent Claim
18 words
The copper alloy of claim 1 wherein the silicon is present in an amount of 0.2-0.47 wt %.
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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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |