US3271852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for exothermic brazing of metal joints
Assignee: Whittaker Corp
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Filing: 1963-09-06
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Granted: 1966-09-13
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Expires: 1983-09-06
Abstract
No abstract record available.
Inventors
- 👤 Roger A Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:21
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
AN EXOTHERMIC BRAZING COMPOUND COMPRISING A MIXTURE OF AT LEAST TWO METAL OXIDES AND A HYDRIDE REDUCING AGENT, SAID METAL OXIDES AND SAID HYDRIDE REDUCING AGENT BEING PRESENT IN PROPORTIONS WHICH WILL REACT EXOTHERMICALLY TO SUBSTANTIALLY COMPLETELY REDUCE SAID OXIDES TO NATIVE METALS WHILE LIBERATING HYDROGEN AND TO GENERATE SUFFICIENT HEAT TO CAUSE SAID NATIVE METALS TO FLOW.
Claim 2
Dependent Claim
58 words
AN EXOTHERMIC BRAZING COMPOUND COMPRISING A MIXTURE OF AT LEAST TWO METAL OXIDES AND A HYDRIDE REDUCING AGENT, SAID METAL OXIDES AND SAID HYDRIDE REDUCING AGENT BEING PRESENT IN PROPORTIONS WHICH WILL REACT EXOTHERMICALLY TO SUBSTANTIALLY COMPLETELY REDUCE SAID OXIDES TO NATIVE METALS WHILE LIBERATING HYDROGEN AND TO GENERATE SUFFICIENT HEAT TO CAUSE SAID NATIVE METALS TO FLOW.
Claim 3
Independent Claim
150 words
A METHOD OF BRAZING TWO METAL PIECES COMPRISING PLACING A METERIAL COMPRISING A MIXTURE OF A PLURALITY OF METAL OXIDES AND A HYDRIDE REDUCING AGENT CAPABLE OF GENERATING HYDROGEN PROTECTIVE GAS IN CLOSE PROXIMITY TO THE AREA OF THE METAL PIECES, THE METAL OXIDES AND HYDRIDE REDUCING AGENT IN SAID MIXTURE BEING PRESENT IN PROPORTIONS WHICH WILL REACT EXOTHERMICALLY TO SUBSTANTIALLY COMPLETELY REDUCE THE OXIDES TO NATIVE METALS AND GENERATE SUFFICIENT HEAT TO CAUSE SAID METALS TO FLOW; HEATING THE MATERIAL TO A TEMPERATURE BELOW THAT NECESSARY FOR BRAZING THE MATERIALS BUT SUFFICIENT TO INITIATE A REACTION IN SAID MIXTURE; CLEANING THE METAL PIECES WITH THE HYDROGEN GAS FORMED BY SAID REACTION; ALLOWING SAID REACTION TO CONTINUE UNTIL THE HEAT PRODUCED BY THE REACTION IS SUFFICIENTLY HIGH TO BRAZE THE METAL PIECES; AND COOLING SAID METALS TO SOLIDIFY THE BRAZE, WHEREBY SUBSTANTIALLY NO RESIDUE OTHER THAN A BRAZE ALLOY REMAINS.
Claim 4
Independent Claim
150 words
A METHOD OF BRAZING TWO METAL PIECES COMPRISING PLACING A METERIAL COMPRISING A MIXTURE OF A PLURALITY OF METAL OXIDES AND A HYDRIDE REDUCING AGENT CAPABLE OF GENERATING HYDROGEN PROTECTIVE GAS IN CLOSE PROXIMITY TO THE AREA OF THE METAL PIECES, THE METAL OXIDES AND HYDRIDE REDUCING AGENT IN SAID MIXTURE BEING PRESENT IN PROPORTIONS WHICH WILL REACT EXOTHERMICALLY TO SUBSTANTIALLY COMPLETELY REDUCE THE OXIDES TO NATIVE METALS AND GENERATE SUFFICIENT HEAT TO CAUSE SAID METALS TO FLOW; HEATING THE MATERIAL TO A TEMPERATURE BELOW THAT NECESSARY FOR BRAZING THE MATERIALS BUT SUFFICIENT TO INITIATE A REACTION IN SAID MIXTURE; CLEANING THE METAL PIECES WITH THE HYDROGEN GAS FORMED BY SAID REACTION; ALLOWING SAID REACTION TO CONTINUE UNTIL THE HEAT PRODUCED BY THE REACTION IS SUFFICIENTLY HIGH TO BRAZE THE METAL PIECES; AND COOLING SAID METALS TO SOLIDIFY THE BRAZE, WHEREBY SUBSTANTIALLY NO RESIDUE OTHER THAN A BRAZE ALLOY REMAINS.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |