Patent US3154141A successfully refreshed from Google Patents.
US3154141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roughened heat exchanger tube
Assignee: Individual
•
Filing: 1960-04-26
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Granted: 1964-10-27
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Expires: 1980-04-26
Abstract
No abstract record available.
Inventors
- 👤 Huet Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:07
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/18; F28F13/185; F28F1/00; F28F1/10; F28F1/12; F28F1/124; 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
103 words
A HEAT-EXCHANGER TUBE DEFINED BY A TUBE WALL HAVING AN OUTER SURFACE PROVIDED WITH INTEGRAL ROUGH, DISCONTINOUS EXCRESCENCES IN RELIEF DISPOSED SPACED FROM EACH OTHER AXIALLY AND CIRCUMFERENTIALLY ON SAID TUBE, SAID EXCRESCENCES BEING LIMITED IN AXIAL AND CIRCUMFERENTIAL EXTENT SO THAT A PLURALITY ARE ACCOMMODATED CIRCUMFERENTIALLY OF SAID TUBE AND AXIALLY OF SAID TUBE, SAID EXCRESCENCES EACH HAVING A HEIGHT OF ABOUT 1/10 OF A MILLIMETER TO ABOUT ONE MILLIMETER WITH RESPECT TO THE SURFACE OF SAID TUBE, SAID EXCRESCENCES VARYING IN HEIGHT OVER THE LENGTH OF SAID TUBE, AND SAID EXCRESCENCES BEING FORMED WHOLLY FROM THE MATERIAL OF SAID TUBE WALL.
Claim 2
Dependent Claim
103 words
A HEAT-EXCHANGER TUBE DEFINED BY A TUBE WALL HAVING AN OUTER SURFACE PROVIDED WITH INTEGRAL ROUGH, DISCONTINOUS EXCRESCENCES IN RELIEF DISPOSED SPACED FROM EACH OTHER AXIALLY AND CIRCUMFERENTIALLY ON SAID TUBE, SAID EXCRESCENCES BEING LIMITED IN AXIAL AND CIRCUMFERENTIAL EXTENT SO THAT A PLURALITY ARE ACCOMMODATED CIRCUMFERENTIALLY OF SAID TUBE AND AXIALLY OF SAID TUBE, SAID EXCRESCENCES EACH HAVING A HEIGHT OF ABOUT 1/10 OF A MILLIMETER TO ABOUT ONE MILLIMETER WITH RESPECT TO THE SURFACE OF SAID TUBE, SAID EXCRESCENCES VARYING IN HEIGHT OVER THE LENGTH OF SAID TUBE, AND SAID EXCRESCENCES BEING FORMED WHOLLY FROM THE MATERIAL OF SAID TUBE WALL.
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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) | 1967-10-27 | 1968-04-27 | 1968-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-27 | 1972-04-27 | 1972-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-27 | 1976-04-27 | 1976-10-27 | $7700.00 | Window Closed / Lapsed |