US3261724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stainless steel clad aluminum and methods of making same
Assignee: Composite Metal Products Inc
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Filing: 1965-06-28
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Granted: 1966-07-19
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Expires: 1985-06-28
Abstract
No abstract record available.
Inventors
- 👤 John B Ulam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:29
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
126 words
THE METHOD OF CLADDING ALUMINUM AND ALUMINUM ALLOYS WITH STAINLESS STEEL WHICH COMPRISES PROVIDING AN OUTER LAYER OF SUBSTANTIALLY PURE ALUMINUM ON SAID ALUMINUM AND ALUMINUM ALLOY REMOVING BY MECHANICAL TREATMENT SUBSTANTIALLY ALL OXIDE FROM THE SURFACES OF THE OUTER LAYER OF 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, BRINGING THE CLEANED SURFACES INTO CONTACT WITH ONE ANOTHER UNDER PRESSURE SUFFICIENT TO EFFECT A SIMULTANEOUS REDUCTION OF 5% TO 35% IN EACH OF THE METALS, URGING THEM TOGETHER TO UNITE THE SURFACES INTO A DIFFUSION BOND AND THEREAFTER ANNEALING AT A TEMPERATURE OF ABOUT 700*F. TO 900*F.
Claim 2
Independent Claim
126 words
THE METHOD OF CLADDING ALUMINUM AND ALUMINUM ALLOYS WITH STAINLESS STEEL WHICH COMPRISES PROVIDING AN OUTER LAYER OF SUBSTANTIALLY PURE ALUMINUM ON SAID ALUMINUM AND ALUMINUM ALLOY REMOVING BY MECHANICAL TREATMENT SUBSTANTIALLY ALL OXIDE FROM THE SURFACES OF THE OUTER LAYER OF 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, BRINGING THE CLEANED SURFACES INTO CONTACT WITH ONE ANOTHER UNDER PRESSURE SUFFICIENT TO EFFECT A SIMULTANEOUS REDUCTION OF 5% TO 35% IN EACH OF THE METALS, URGING THEM TOGETHER TO UNITE THE SURFACES INTO A DIFFUSION BOND AND THEREAFTER ANNEALING AT A TEMPERATURE OF ABOUT 700*F. TO 900*F.
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) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |