Patent US4632127A successfully refreshed from Google Patents.
Patent US2754572A successfully refreshed from Google Patents.
US2754572A
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Method of making roll welded hollow sheet metal structure
Assignee: Olin Corp
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Filing: 1954-07-14
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Granted: 1956-07-17
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Expires: 1974-07-14
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:55
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; B21D53/045; Y; Y10; Y10S; Y10S72/00; Y10S72/70; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49366; Y10T29/49805
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN THE MANUFACTURE OF HOLLOW METAL FABRICATIONS FROM SHEET METAL BY A PROCESS WHICH INVOLVES INTERPOSING A PATTERN OF STOP-OFF MATERIAL BETWEEN ADJACENT SURFACES OF SHEET METAL LAYERS LYING IN FACE TO FACE RELATIONSHIP, FORGE WELDING BY ROLLING THOSE AREAS NOT PROTECTED BY THE STOP-OFF MATERIAL, AND THEREAFTER INFLATING THE UNWELDED AREAS BY MEANS OF FLUID PRESSURE; THE METHOD OF SECURING THE SHEET METAL LAYERS AGAINST RELATIVE SLIPPAGE BEFORE AND DURING ROLLING WITHOUT SPOT-WELDING WHICH COMPRISES, GROOVING A SINGLE SHEET OF METAL AND BENDING AND FOLDING THE SHEET TO PROVIDE THE PLURALITY OF LAYERS THEREOF LYING IN FACE TO FACE RELATIONSHIP PRIOR TO FORGE WELDING.
Claim 2
Dependent Claim
105 words
IN THE MANUFACTURE OF HOLLOW METAL FABRICATIONS FROM SHEET METAL BY A PROCESS WHICH INVOLVES INTERPOSING A PATTERN OF STOP-OFF MATERIAL BETWEEN ADJACENT SURFACES OF SHEET METAL LAYERS LYING IN FACE TO FACE RELATIONSHIP, FORGE WELDING BY ROLLING THOSE AREAS NOT PROTECTED BY THE STOP-OFF MATERIAL, AND THEREAFTER INFLATING THE UNWELDED AREAS BY MEANS OF FLUID PRESSURE; THE METHOD OF SECURING THE SHEET METAL LAYERS AGAINST RELATIVE SLIPPAGE BEFORE AND DURING ROLLING WITHOUT SPOT-WELDING WHICH COMPRISES, GROOVING A SINGLE SHEET OF METAL AND BENDING AND FOLDING THE SHEET TO PROVIDE THE PLURALITY OF LAYERS THEREOF LYING IN FACE TO FACE RELATIONSHIP PRIOR TO FORGE WELDING.
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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) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |