Patent US3148441A successfully refreshed from Google Patents.
US3148441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making attached fin type tubes
Assignee: Calumet and Hecla Inc
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Filing: 1959-09-14
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Granted: 1964-09-15
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Expires: 1979-09-14
Abstract
No abstract record available.
Inventors
- 👤 Otto R Schuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:23
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/26; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49382; Y10T29/51; Y10T29/5188
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A METHOD OF APPLYING FIN MATERIAL TO A TUBE WHICH IS EXTERNALLY AND HELICALLY RIBBED CIRCUMFERENTIALLY, COMPRISING THE STEPS OF DEFORMING AXIALLY COILED FLAT FIN MATERIAL ADJACENT THE OUTER PERIPHERY OF THE COIL CONVOLUTION TO PROGRESSIVELY INCREASE THE INNER PERIPHERY OF THE CONVOLUTION TO A DIAMETER GREATER THAN THE OUTER DIAMETER OF THE TUBE RIBS, GUIDING SAID DEFORMED MATERIAL INTO POSITION RADIALLY OUTWARDLY OF THE SPACE BETWEEN THE TUBE RIBS, WHILE POSITIVELY SUPPORTING SAID DEFORMED COILED FIN MATERIAL RADIALLY AGAINST INTERFERENCE WITH THE RIBS PRIOR TO REACHING SAID POSITION, AND SMOOTHING SAID FIN DEFORMATION TO CAUSE A PROGRESSIVE REDUCTION IN SAID INTERNAL DIAMETER OF THE CONVOLUTION OF THE FIN MATERIAL TOWARD THE DIAMETER OF THE TUBE BETWEEN RIBS, AND TO AT LEAST PARTIALLY DISPOSE SAID REDUCED INTERNAL DIAMETER CONVOLUTION IN THE SPACE BETWEEN SAID RIBS.
Claim 2
Independent Claim
135 words
A METHOD OF APPLYING FIN MATERIAL TO A TUBE WHICH IS EXTERNALLY AND HELICALLY RIBBED CIRCUMFERENTIALLY, COMPRISING THE STEPS OF DEFORMING AXIALLY COILED FLAT FIN MATERIAL ADJACENT THE OUTER PERIPHERY OF THE COIL CONVOLUTION TO PROGRESSIVELY INCREASE THE INNER PERIPHERY OF THE CONVOLUTION TO A DIAMETER GREATER THAN THE OUTER DIAMETER OF THE TUBE RIBS, GUIDING SAID DEFORMED MATERIAL INTO POSITION RADIALLY OUTWARDLY OF THE SPACE BETWEEN THE TUBE RIBS, WHILE POSITIVELY SUPPORTING SAID DEFORMED COILED FIN MATERIAL RADIALLY AGAINST INTERFERENCE WITH THE RIBS PRIOR TO REACHING SAID POSITION, AND SMOOTHING SAID FIN DEFORMATION TO CAUSE A PROGRESSIVE REDUCTION IN SAID INTERNAL DIAMETER OF THE CONVOLUTION OF THE FIN MATERIAL TOWARD THE DIAMETER OF THE TUBE BETWEEN RIBS, AND TO AT LEAST PARTIALLY DISPOSE SAID REDUCED INTERNAL DIAMETER CONVOLUTION IN THE SPACE BETWEEN SAID RIBS.
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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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |