US3267564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing duplex internally finned tube unit
Assignee: WOLVERINE ACQUISITION CORP A DE CORP
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Filing: 1964-04-23
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Granted: 1966-08-23
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Expires: 1984-04-23
Abstract
No abstract record available.
Inventors
- 👤 John M Keyes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:41
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/001; B21; B21C; B21C1/00; B21C1/16; B21C1/22; B21C23/00; B21C23/02; B21C23/04; B21C23/08; B21C23/10; B21C23/22; B21C37/00; B21C37/06; B21C37/15; B21C37/154; B21C37/20; B21C37/202; B21D; B21D53/00; B21D53/02; B21D53/06; F; F28; F28F; F28F1/00; F28F1/10; F28F1/40; F28F13/00; F28F13/18; F28F13/185; F28F19/00; F28F19/02; F28F19/06; F28F21/00; F28F21/08; F28F21/081; F28F21/084; F28F21/085; Y; Y10; Y10S; Y10S29/00; Y10S29/047; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49361; Y10T29/49377; Y10T29/49378; Y10T29/49384; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T29/49934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF PRODUCING AN INTERNALLY FINNED TUBE UNIT, COMPRISING EXTRUDING A FIRST METAL TUBE TO PROVIDE FINS PREDETERMINEDLY SPACED CIRCUMFERENTIALLY ABOUT AND PROJECTING INWARDLY OF THE INNER SURFACE OF SAID TUBE, DRAWING SAID TUBE TO REDUCE THE OUTER DIAMETER THEREOF AND BRING THE INNER EXTREMITIES OF SAID SPACED FINS RADIALLY AND CIRCUMFERENTIALLY CLOSER TO ONE ANOTHER THAN WAS PRACTICALLY POSSIBLE IN SAID EXTRUDING OF SAID FIRST TUBE, TELESCOPING SAID FIRST TUBE WITHIN A SECOND TUBE OF METAL, AND SINKING SAID TELESCOPED TUBES TO BRING THE SAME IN TIGHT CONTACT WITH ONE ANOTHER.
Claim 2
Independent Claim
93 words
A METHOD OF PRODUCING AN INTERNALLY FINNED TUBE UNIT, COMPRISING EXTRUDING A FIRST METAL TUBE TO PROVIDE FINS PREDETERMINEDLY SPACED CIRCUMFERENTIALLY ABOUT AND PROJECTING INWARDLY OF THE INNER SURFACE OF SAID TUBE, DRAWING SAID TUBE TO REDUCE THE OUTER DIAMETER THEREOF AND BRING THE INNER EXTREMITIES OF SAID SPACED FINS RADIALLY AND CIRCUMFERENTIALLY CLOSER TO ONE ANOTHER THAN WAS PRACTICALLY POSSIBLE IN SAID EXTRUDING OF SAID FIRST TUBE, TELESCOPING SAID FIRST TUBE WITHIN A SECOND TUBE OF METAL, AND SINKING SAID TELESCOPED TUBES TO BRING THE SAME IN TIGHT CONTACT WITH ONE ANOTHER.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |