Patent US4380780A successfully refreshed from Google Patents.
Patent US3333082A successfully refreshed from Google Patents.
US3333082A
Expired / Lapsed
US
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Brazing tool
Assignee: Allis Chalmers Corp
•
Filing: 1964-11-19
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Granted: 1967-07-25
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Expires: 1984-11-19
Abstract
No abstract record available.
Inventors
- 👤 Nathan A Randall
- 👤 Alfred E Gruel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:10
CPC Classifications
B; B23; B23K; B23K3/00; B23K3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A BRAZING DEVICE COMPRISING: A PAIR OF OPPOSITELY FACING SETS OF CARBON BLOCKS, EACH SAID SET HAVING A PLURALITY OF BLOCKS HAVING A FLAT SURFACE FOR ENGAGING THE WORK TO BE BRAZED, A PAIR OF LOW RESISTANT ELECTRICALLY CONDUCTIIVE FLEXIBLE BACKING MEMBERS SAID BLOCK, ENGAGING EACH AT A SOURCE OF HIGH ELECTRICAL CURRENT CONNECTED TO SAID MEMBERS IN A MANNER TO CAUSE SAID CURRENT TO FLOW THROUGH SAID BACKING MEMBERS, BLOCKS AND WORK TO BE BRAZED, A BELLOWS POSITIONED ADJACENT EACH OF SAID FLEXIBLE MEMBERS OR THE OPPOSITE SIDE FROM SAID BLOCKS, AND MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO THE INTERIOR OF SAID BELLOWS TO EXERT AN INDEPENDENT PRESSURE ON EACH OF SAID BLOCKS THROUGH SAID FLEXIBLE BACKING MEMBER AND THEREBY OBTAIN A MAXIMUM SURFACE CONTACT BETWEEN SAID BLOCKS AND THE MATERIAL TO BE BRAZED.
Claim 2
Dependent Claim
136 words
A BRAZING DEVICE COMPRISING: A PAIR OF OPPOSITELY FACING SETS OF CARBON BLOCKS, EACH SAID SET HAVING A PLURALITY OF BLOCKS HAVING A FLAT SURFACE FOR ENGAGING THE WORK TO BE BRAZED, A PAIR OF LOW RESISTANT ELECTRICALLY CONDUCTIIVE FLEXIBLE BACKING MEMBERS SAID BLOCK, ENGAGING EACH AT A SOURCE OF HIGH ELECTRICAL CURRENT CONNECTED TO SAID MEMBERS IN A MANNER TO CAUSE SAID CURRENT TO FLOW THROUGH SAID BACKING MEMBERS, BLOCKS AND WORK TO BE BRAZED, A BELLOWS POSITIONED ADJACENT EACH OF SAID FLEXIBLE MEMBERS OR THE OPPOSITE SIDE FROM SAID BLOCKS, AND MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO THE INTERIOR OF SAID BELLOWS TO EXERT AN INDEPENDENT PRESSURE ON EACH OF SAID BLOCKS THROUGH SAID FLEXIBLE BACKING MEMBER AND THEREBY OBTAIN A MAXIMUM SURFACE CONTACT BETWEEN SAID BLOCKS AND THE MATERIAL TO BE BRAZED.
References Cited (Backward Citations)
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Cited
US1772444A
Cited
US1918226A
Cited
US2266424A
Cited
US3093104A
Cited
US3053969A
Cited
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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) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |