Patent US2704883A successfully refreshed from Google Patents.
US2704883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of welding carbon steel to stainless steel
Assignee: United States Steel Corp
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Filing: 1952-02-18
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Granted: 1955-03-29
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Expires: 1972-02-18
Abstract
No abstract record available.
Inventors
- 👤 Jack L Hamilton
- 👤 Matti H Pakkala
- 👤 Smith Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:09
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/227
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
IN THE MANUFACTURE OF CLAD METAL COMPOSED OF A BASE OF PLAIN CARBON STEEL AND A SURFACE LAYER OF STAINLESS STEEL WELDED THERETO, THE STEPS INCLUDING FIRST REMOVING SUBSTANTIALLY ALL THE SCALE FROM THE SURFACE OF THE PLAIN CARBON STEEL BASE, THEN SUBJECTING THE RESULTING SCALE-FREE SURFACE TO THE ACTION OF NITRIC ACID OF A CONCENTRATION FROM 6 TO 10% AT A TEMPERATURE FROM 140* TO 180*F. FOR ABOUT A MINUTE THEREBY RENDERING THE SURFACE RESISTANT TO OXIDATION AND PUTTING IT IN A STATE FAVORING THE FORMATION OF A PERMANENT BOND BETWEEN THE BASE AND CLADDING LAYER, THEN, BEFORE THE BASE DRIES, REMOVING ALL TRACES OF SMUDGE FORMED THEREON, WASHING THE BASE WITH WATER AND IMMEDIATELY DRYING IT, REMOVING THE SCALE FROM THE SURFACE OF A STAINLESS STEEL CLADDING PIECE THEN SUPERPOSING ON SAID BASE THE CLADDING PIECE OF STAINLESS STEEL WITH THE CLEANED SURFACES IN ABUTTING RELATIONSHIP, HEATING THE BASE AND CLADDING TO WELDING TEMPERATURE, AND HOTROLLING THEM TO WELD THEM TOGETHER
Claim 2
Dependent Claim
163 words
IN THE MANUFACTURE OF CLAD METAL COMPOSED OF A BASE OF PLAIN CARBON STEEL AND A SURFACE LAYER OF STAINLESS STEEL WELDED THERETO, THE STEPS INCLUDING FIRST REMOVING SUBSTANTIALLY ALL THE SCALE FROM THE SURFACE OF THE PLAIN CARBON STEEL BASE, THEN SUBJECTING THE RESULTING SCALE-FREE SURFACE TO THE ACTION OF NITRIC ACID OF A CONCENTRATION FROM 6 TO 10% AT A TEMPERATURE FROM 140* TO 180*F. FOR ABOUT A MINUTE THEREBY RENDERING THE SURFACE RESISTANT TO OXIDATION AND PUTTING IT IN A STATE FAVORING THE FORMATION OF A PERMANENT BOND BETWEEN THE BASE AND CLADDING LAYER, THEN, BEFORE THE BASE DRIES, REMOVING ALL TRACES OF SMUDGE FORMED THEREON, WASHING THE BASE WITH WATER AND IMMEDIATELY DRYING IT, REMOVING THE SCALE FROM THE SURFACE OF A STAINLESS STEEL CLADDING PIECE THEN SUPERPOSING ON SAID BASE THE CLADDING PIECE OF STAINLESS STEEL WITH THE CLEANED SURFACES IN ABUTTING RELATIONSHIP, HEATING THE BASE AND CLADDING TO WELDING TEMPERATURE, AND HOTROLLING THEM TO WELD THEM TOGETHER
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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) | 1958-03-28 | 1958-09-27 | 1959-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-28 | 1962-09-27 | 1963-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-28 | 1966-09-27 | 1967-03-29 | $7700.00 | Window Closed / Lapsed |