Patent US2723448A successfully refreshed from Google Patents.
US2723448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brazing process
Assignee: Alcoa Corp
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Filing: 1952-08-30
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Granted: 1955-11-15
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Expires: 1972-08-30
Abstract
No abstract record available.
Inventors
- 👤 Mike A Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:08
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3601; B23K35/3603
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
216 words
THE METHOD OF BRAZING ALUMINOUS METAL MEMBERS BY THE DIP BRAZING PROCESS WHICH COMPRISES ASSEMBLING SAID MEMBERS IN THE DESIRED JOINT RELATIONSHIP TO EACH OTHER WITH FILLER METAL ADJACENT EACH JOINT, IMMERSING THE ASSEMBLY IN A SALT BATH MAINTAINED AT A TEMPERATURE BETWEEN THE MELTING POINT OF THE FILLER METAL AND THE MELTING POINT OF THE ALUMINOUS METAL MEMBERS AND ACTIVATED FOR BRAZING PURPOSES BY INTRODUCING INTO THE BODY OF SAID BATH AT LEAST ONE ANHYDROUS HYDROHALIDE OF THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN FLUORIDE FOR A SUFFICIENT LENGTH OF TIME TO PERMIT FORMATION OF BRAZED JOINTS, SAID BATH BEING FREE FROM HEAVY METAL HALIDES AND HAVING AS ITS ESSENTIAL COMPONENTS FROM 2 TO 60% BY WEIGHT OF AT LEAST ONE SALT OF THE GROUP CONSISTING OF THE CHLORIDES OF BERYLLIUM, CALCIUM, BARIUM, STRONTIUM AND MAGNESIUM, FROM 0.5 TO 10% OF AT LEAST ONE SALT OF THE GROUP CONSISTING OF THE FLUORIDES OF BERYLLIUM, MAGNESIUM AND ALUMINUM AND THE DOUBLE FLUORIDES OF ALUMINUM BA DTHE ALKALI METALS, AND THE BALANCE CONSISTING SUBSTANTIALLY OF AT LEAST ONE ALKALI METAL CHLORIDE, THE TOTAL AMOUNT OF ALL OF SAID CHLORIDES CONSTITUTING THE MAJOR PORTION OF SAID SALT BATH, AND FINALLY WITHDRAWING SAID ASSEMBLY FROM SAID BATH WHEN THE FILLER METAL HAS ESTABLISHED A JOINT BETWEEN SAID MEMBERS.
Claim 2
Independent Claim
216 words
THE METHOD OF BRAZING ALUMINOUS METAL MEMBERS BY THE DIP BRAZING PROCESS WHICH COMPRISES ASSEMBLING SAID MEMBERS IN THE DESIRED JOINT RELATIONSHIP TO EACH OTHER WITH FILLER METAL ADJACENT EACH JOINT, IMMERSING THE ASSEMBLY IN A SALT BATH MAINTAINED AT A TEMPERATURE BETWEEN THE MELTING POINT OF THE FILLER METAL AND THE MELTING POINT OF THE ALUMINOUS METAL MEMBERS AND ACTIVATED FOR BRAZING PURPOSES BY INTRODUCING INTO THE BODY OF SAID BATH AT LEAST ONE ANHYDROUS HYDROHALIDE OF THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN FLUORIDE FOR A SUFFICIENT LENGTH OF TIME TO PERMIT FORMATION OF BRAZED JOINTS, SAID BATH BEING FREE FROM HEAVY METAL HALIDES AND HAVING AS ITS ESSENTIAL COMPONENTS FROM 2 TO 60% BY WEIGHT OF AT LEAST ONE SALT OF THE GROUP CONSISTING OF THE CHLORIDES OF BERYLLIUM, CALCIUM, BARIUM, STRONTIUM AND MAGNESIUM, FROM 0.5 TO 10% OF AT LEAST ONE SALT OF THE GROUP CONSISTING OF THE FLUORIDES OF BERYLLIUM, MAGNESIUM AND ALUMINUM AND THE DOUBLE FLUORIDES OF ALUMINUM BA DTHE ALKALI METALS, AND THE BALANCE CONSISTING SUBSTANTIALLY OF AT LEAST ONE ALKALI METAL CHLORIDE, THE TOTAL AMOUNT OF ALL OF SAID CHLORIDES CONSTITUTING THE MAJOR PORTION OF SAID SALT BATH, AND FINALLY WITHDRAWING SAID ASSEMBLY FROM SAID BATH WHEN THE FILLER METAL HAS ESTABLISHED A JOINT BETWEEN SAID MEMBERS.
References Cited (Backward Citations)
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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) | 1958-11-14 | 1959-05-16 | 1959-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-14 | 1963-05-16 | 1963-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-14 | 1967-05-16 | 1967-11-15 | $7700.00 | Window Closed / Lapsed |