US3581382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion brazing of aluminum and aluminum base alloys
Assignee: Northrop Grumman Corp
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Filing: 1968-10-07
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Granted: 1971-06-01
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Expires: 1988-10-07
Abstract
Abstract A SELF-FLUXING METHOD FOR JOINTING TWO SURFACES OF ALUMINUM AND ALUMINUM BASE ALLOYS COMPRISING COATING ONE OF THE MATING SURFACE WITH A THIN LAYER OF COPPER, THEN PLACING A THIN LAYER OF TIN OVER THE COPPER, PLACING THE TWO PIECES TO BE JOINTED TOGETHER AND HEATING TO AT LEAST THE EUTECTIC TEMPERATURE FOR A TERNARY ALUMINUM-COPPER-TIN ALLOY SYSTEM. THE MAXIMUM TEMPERATURE OF HEATING CAN BE LOWERED BY THE ADDITION OF A SMALL AMOUNT OF SILVER WHICH IS COATED ON THE COPPER BEFORE THE TIN LAYER IS PLACED THEREON.
Inventors
- 👤 Robert R Wells
- 👤 Bobby J Mays
- 👤 Terry A Krinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:48
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |