US3071159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger tube
Assignee: Individual
•
Filing: 1959-04-15
•
Granted: 1963-01-01
•
Expires: 1979-04-15
Abstract
No abstract record available.
Inventors
- 👤 Coraggioso Corrado Bono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:59
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/122; F28F13/00; F28F13/06; F28F13/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A HEAT EXCHANGER TUBE HAVING INSIDE THEREOF AND CONCENTRICALLY THEREWITH A TUBULAR BODY CLOSED AT ONE END, SAID BODY HAVE A CROSS-SECTIONAL AREA WHICH IS SUBSTANTIALLY LARGE WITH RESPECT TO THE CROSS-SECTIONAL AREA OF SAID TUBE SO AS TO LEAVE A TUBULAR PASSAGE BETWEEN SAID BODY AND THE INTERIOR SURFACE OF SAID TUBE, AND AT LEAST ONE RELATIVELY LONGITUDINALLY NARROW ELONGATED MEMBER WOUND SPIRALLY ON SAID BODY ALONG ITS LENGTH WITH THE TURNS OF SAID MEMBER SUBSTANTIALLY WIDELY SPACED FROM EACH OTHER, THE SPIRAL CRESTS OF SAID ELONGATED MEMBER BEING SPACED FROM THE INTERIOR SURFACE OF SAID TUBE TO PROVIDE A TUBULAR PASSAGE FOR THE RESTRICTED BUT SUBSTANTIAL FLOW OF FLUID THERETHROUGH.
Claim 2
Dependent Claim
112 words
A HEAT EXCHANGER TUBE HAVING INSIDE THEREOF AND CONCENTRICALLY THEREWITH A TUBULAR BODY CLOSED AT ONE END, SAID BODY HAVE A CROSS-SECTIONAL AREA WHICH IS SUBSTANTIALLY LARGE WITH RESPECT TO THE CROSS-SECTIONAL AREA OF SAID TUBE SO AS TO LEAVE A TUBULAR PASSAGE BETWEEN SAID BODY AND THE INTERIOR SURFACE OF SAID TUBE, AND AT LEAST ONE RELATIVELY LONGITUDINALLY NARROW ELONGATED MEMBER WOUND SPIRALLY ON SAID BODY ALONG ITS LENGTH WITH THE TURNS OF SAID MEMBER SUBSTANTIALLY WIDELY SPACED FROM EACH OTHER, THE SPIRAL CRESTS OF SAID ELONGATED MEMBER BEING SPACED FROM THE INTERIOR SURFACE OF SAID TUBE TO PROVIDE A TUBULAR PASSAGE FOR THE RESTRICTED BUT SUBSTANTIAL FLOW OF FLUID THERETHROUGH.
References Cited (Backward Citations)
US154203A
Cited
US172302A
Cited
US538586A
Cited
US660761A
Cited
US787593A
Cited
FR531299A
Cited
US1469531A
Cited
US1436190A
Cited
US1833876A
Cited
US2068477A
Cited
US2262530A
Cited
US2215538A
Cited
US2360094A
Cited
GB557085A
Cited
US2608968A
Cited
US2756037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |