Patent US3769005A successfully refreshed from Google Patents.
US3769005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper nickel alloys
Assignee: Langley Alloys Ltd
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Filing: 1971-07-07
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Granted: 1973-10-30
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Expires: 1991-07-07
Abstract
Abstract A high quality, high strength, highly ductile, castable, weldable and corrosion resistant Copper alloy consisting of the following elements in the following proportions by weight : Nickel 9% - 18% Aluminium 1% - 3.5% Manganese 8.5% - 13% Iron 2.5% - 6.5% Chromium 0% - 1% Copper the balance WITH THE Aluminium, Manganese and Nickel contents being so controlled t
Inventors
- 👤 W Richardson
- 👤 P Guha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:15
CPC Classifications
C; C22; C22C; C22C9/00; C22C9/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
possesses a 0.5 percent Proof Stress of at least 17.5 tons per square inch
Claim 2
Dependent Claim
13 words
possesses an Ultimate Tensile Strength of at least 30 tons per square inch
Claim 3
Dependent Claim
11 words
has an Izod Impact value of at least 26 ft. lbs.
Claim 4
Dependent Claim
8 words
has a low magnetic permeability not exceeding 1.05.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |