Patent US4592924A successfully refreshed from Google Patents.
Patent US3282335A successfully refreshed from Google Patents.
US3282335A
Expired / Lapsed
US
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Heat transfer tube
Assignee: Sulzer AG
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Filing: 1964-09-04
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Granted: 1966-11-01
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Expires: 1984-09-04
Abstract
No abstract record available.
Inventors
- 👤 Haller Pierre De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:41
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/16; G; G21; G21C; G21C3/00; G21C3/02; G21C3/04; G21C3/06; G21C3/08; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A HEAT TRANSFER TUBE COMPRISING: A PLURALITY OF FINS EXTENDING SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS OF THE TUBE AND EXTENDING SUBSTANTIALLY RADIALLY FROM THE TUBE, SAID FINS BEING PROVIDED WITH CHANNELS EXTENDING AT A SLANT THROUGH THE FINS, SUCH CHANNELS HAVING THE AXES THEREOF PLACED ALONG HELICAL LINES EXTENDING AROUND SAID TUBE.
Claim 2
Dependent Claim
53 words
A HEAT TRANSFER TUBE COMPRISING: A PLURALITY OF FINS EXTENDING SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS OF THE TUBE AND EXTENDING SUBSTANTIALLY RADIALLY FROM THE TUBE, SAID FINS BEING PROVIDED WITH CHANNELS EXTENDING AT A SLANT THROUGH THE FINS, SUCH CHANNELS HAVING THE AXES THEREOF PLACED ALONG HELICAL LINES EXTENDING AROUND SAID TUBE.
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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |