US2807541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welding aluminium alloys
Assignee: National Research Development Corp UK
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Filing: 1955-07-05
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Granted: 1957-09-24
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Expires: 1975-07-05
Abstract
No abstract record available.
Inventors
- 👤 Houldcroft Peter Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:18
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS OF WELDING ALUMINUM SILICON COPPER MAGNESIUM ALLOYS KNOWN AS DURALUMIN TYPE ALLOYS, BY USING A FILLER ALLOY COMPRISING BETWEEN 5.5 AND 7.5 PERCENT OF COPPER, BETWEEN 3.0 AND 4.0 PERCENT OF SILICON, BETWEEN 0.3 AND 1.0 PERCENT OF MAGNESIUM, BETWEEN 0.1 AND 0.8 PERCENT TITANIUM, UP TO 1.0 PERCENT MANGANESE, UP TO 1.0 PERCENT IRON AND UP TO 0.8 PERCENT MANGANESE, UP TO 1.0 BEING ALUMINIUM.
Claim 2
Dependent Claim
68 words
A PROCESS OF WELDING ALUMINUM SILICON COPPER MAGNESIUM ALLOYS KNOWN AS DURALUMIN TYPE ALLOYS, BY USING A FILLER ALLOY COMPRISING BETWEEN 5.5 AND 7.5 PERCENT OF COPPER, BETWEEN 3.0 AND 4.0 PERCENT OF SILICON, BETWEEN 0.3 AND 1.0 PERCENT OF MAGNESIUM, BETWEEN 0.1 AND 0.8 PERCENT TITANIUM, UP TO 1.0 PERCENT MANGANESE, UP TO 1.0 PERCENT IRON AND UP TO 0.8 PERCENT MANGANESE, UP TO 1.0 BEING ALUMINIUM.
References Cited (Backward Citations)
US2271210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |