Patent US2628599A successfully refreshed from Google Patents.
Patent US3080916A successfully refreshed from Google Patents.
US3080916A
Expired / Lapsed
US
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Heat transfer unit
Assignee: Sundstrand Heat Transfer Inc
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Filing: 1958-05-28
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Granted: 1963-03-12
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Expires: 1978-05-28
Abstract
No abstract record available.
Inventors
- 👤 William A Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:08
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F28D1/04; F28D1/047; F28D1/0477; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/32; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/50; Y10S165/501; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/4938
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
IN A TUBULAR HEAT EXCHANGER, A PLURALITY OF EQUAL SIZED TUBES EXTENDING IN PARALLEL RELATION TO EACH OTHER AND ARRANGED SO THAT THE CENTRAL AXES OF ONE GROUP OF SAID TUBES LIE WITHIN A COMMON PLANE, AND THE CENTRAL AXES OF A SECOND GROUP OF SAID TUBES LIE WITHIN ANOTHER COMMON PLANE SPACED FROM THE FIRST SAID PLANE AND PARALLEL THERETO, SAID TUBES FURTHER BEING ARRANGED SO THAT THE CENTRAL AXES OF ANY TWO ADJACENT TUBES IN EITHER OF SAID GROUPS ARE EQUIDISTANT FROM THE CENTRAL AXIS OF A TUBE IN THE OTHER OF SAID GROUPS AND FROM EACH OTHER SO AS TO DEFINE AN EQUILATERAL TRIANGLE BETWEEN SUCH TUBE CENTERS REGARDED IN CROSS SECTION, THE ARRANGEMENT OF TUBES BEING FURTHER CHARACTERIZED BY THE FACT THAT THE DISTANCE BETWEEN SAID AXES AMONG THE GROUPS AND WITHIN THE SAME GROUP IS EQUAL TO 2D, AND THE DISTANCE BETWEEN SAID PARALLEL PLANES IS 1.7333D, WHERE D EQUALS THE OUTSIDE DIAMETER OF SAID TUBES, ALL DIMENSIONAL VARIATIONS WITHIN STANDARD MANUFACTURING PRACTICES BEING TOLERATED.
Claim 2
Dependent Claim
170 words
IN A TUBULAR HEAT EXCHANGER, A PLURALITY OF EQUAL SIZED TUBES EXTENDING IN PARALLEL RELATION TO EACH OTHER AND ARRANGED SO THAT THE CENTRAL AXES OF ONE GROUP OF SAID TUBES LIE WITHIN A COMMON PLANE, AND THE CENTRAL AXES OF A SECOND GROUP OF SAID TUBES LIE WITHIN ANOTHER COMMON PLANE SPACED FROM THE FIRST SAID PLANE AND PARALLEL THERETO, SAID TUBES FURTHER BEING ARRANGED SO THAT THE CENTRAL AXES OF ANY TWO ADJACENT TUBES IN EITHER OF SAID GROUPS ARE EQUIDISTANT FROM THE CENTRAL AXIS OF A TUBE IN THE OTHER OF SAID GROUPS AND FROM EACH OTHER SO AS TO DEFINE AN EQUILATERAL TRIANGLE BETWEEN SUCH TUBE CENTERS REGARDED IN CROSS SECTION, THE ARRANGEMENT OF TUBES BEING FURTHER CHARACTERIZED BY THE FACT THAT THE DISTANCE BETWEEN SAID AXES AMONG THE GROUPS AND WITHIN THE SAME GROUP IS EQUAL TO 2D, AND THE DISTANCE BETWEEN SAID PARALLEL PLANES IS 1.7333D, WHERE D EQUALS THE OUTSIDE DIAMETER OF SAID TUBES, ALL DIMENSIONAL VARIATIONS WITHIN STANDARD MANUFACTURING PRACTICES BEING TOLERATED.
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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) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |