Patent US3210840A successfully refreshed from Google Patents.
US3210840A
Expired / Lapsed
US
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Stainless steel clad aluminum and methods of making same
Assignee: Composite Metal Products Inc
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Filing: 1961-08-08
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Granted: 1965-10-12
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Expires: 1981-08-08
Abstract
No abstract record available.
Inventors
- 👤 John B Ulam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:56
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/227; B23K20/2275; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE METHOD OF CLADDING ALUMINUM WITH STAINLESS STEEL WHICH COMPRISES REMOVING BY MECHANICAL TREATMENT SUBSTANTIALLY ALL OXIDE FROM THE SURFACES OF THE ALUMINUM AND STAINLESS STEEL TO BE BONDED, HEATING THE METAL SURFACES TO A TEMPERATURE ABOVE THE RECRYSTALLIZATION TEMPERATURE OF ALUMINUM BUT BELOW THE MELTING POINT OF ALUMINUM AND BELOW THE RECRYSTALLIZATION TEMPERATURE OF THE STAINLESS STEEL, AND BRINGING THE CLEANED SURFACES INTO CONTACT WITH ONE ANOTHER UNDER PRESSURE SUFFICIENT TO EFFECT A SIMULTANEOUS REDUCTION UP TO 35% IN EACH OF THE METALS, URGING THEM TOGETHER TO UNITE THE SURFACES INTO A DIFFUSION BOND.
Claim 2
Independent Claim
95 words
THE METHOD OF CLADDING ALUMINUM WITH STAINLESS STEEL WHICH COMPRISES REMOVING BY MECHANICAL TREATMENT SUBSTANTIALLY ALL OXIDE FROM THE SURFACES OF THE ALUMINUM AND STAINLESS STEEL TO BE BONDED, HEATING THE METAL SURFACES TO A TEMPERATURE ABOVE THE RECRYSTALLIZATION TEMPERATURE OF ALUMINUM BUT BELOW THE MELTING POINT OF ALUMINUM AND BELOW THE RECRYSTALLIZATION TEMPERATURE OF THE STAINLESS STEEL, AND BRINGING THE CLEANED SURFACES INTO CONTACT WITH ONE ANOTHER UNDER PRESSURE SUFFICIENT TO EFFECT A SIMULTANEOUS REDUCTION UP TO 35% IN EACH OF THE METALS, URGING THEM TOGETHER TO UNITE THE SURFACES INTO A DIFFUSION BOND.
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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) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |