Patent US2539247A successfully refreshed from Google Patents.
US2539247A
Expired / Lapsed
US
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Method of bonding aluminum to steel
Assignee: Duracell Inc USA
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Filing: 1945-07-31
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Granted: 1951-01-23
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Expires: 1965-07-31
Abstract
No abstract record available.
Inventors
- 👤 Franz R Hensel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:06
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/002; B23K20/00; B23K20/24; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12743
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
THE METHOD OF MAKING ALUMINUM-STEEL OVERLAY METAL FROM LAYERS OF ALUMINUM AND STEEL WHICH COMPRISES CLEANING THE BONDING SURFACES OF THE ALUMINUM AND STEEL LAYERS, COATING THE BONDING SURFACE OF THE STEEL LAYER WITH A LAYER OF SILVER HAVING A THICKNESS BETWEEN ABOUT 0.000025" AND ABOUT 0.001", PLACING SAID SILVER COATING ON THE STEEL LAYER IN CONTACT WITH THE CLEANED SURFACE OF THE ALUMINUM LAYER, PREHEATING THE LAYERS UNDER NON-OXIDIZING CONDITIONS TO A TEMPERATURE BELOW THE MELTING POINT OF SILVER AND BETWEEN ABOVE 350* AND ABOUT 525* C., AND APPLYING ROLLING PRESSURE TO SAID PREHEATED LAYERS TO REDUCE THE THICKNESS OF THE LAYERS AND TO PERMANENTLY BOND THE LAYERS TOGETHER.
Claim 2
Independent Claim
110 words
THE METHOD OF MAKING ALUMINUM-STEEL OVERLAY METAL FROM LAYERS OF ALUMINUM AND STEEL WHICH COMPRISES CLEANING THE BONDING SURFACES OF THE ALUMINUM AND STEEL LAYERS, COATING THE BONDING SURFACE OF THE STEEL LAYER WITH A LAYER OF SILVER HAVING A THICKNESS BETWEEN ABOUT 0.000025" AND ABOUT 0.001", PLACING SAID SILVER COATING ON THE STEEL LAYER IN CONTACT WITH THE CLEANED SURFACE OF THE ALUMINUM LAYER, PREHEATING THE LAYERS UNDER NON-OXIDIZING CONDITIONS TO A TEMPERATURE BELOW THE MELTING POINT OF SILVER AND BETWEEN ABOVE 350* AND ABOUT 525* C., AND APPLYING ROLLING PRESSURE TO SAID PREHEATED LAYERS TO REDUCE THE THICKNESS OF THE LAYERS AND TO PERMANENTLY BOND THE LAYERS TOGETHER.
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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) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |