Patent US3217798A successfully refreshed from Google Patents.
US3217798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger
Assignee: American Radiator and Standard Sanitary Corp
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Filing: 1962-12-05
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Granted: 1965-11-16
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Expires: 1982-12-05
Abstract
No abstract record available.
Inventors
- 👤 Peter N Renzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:02
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/495; Y10S165/497; Y10S165/498; Y10S165/905; Y10S165/907; Y10S165/92; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/4938
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A HEAT EXCHANGE UNIT COMPRISING A SERIES OF SERPENTINE HEAT EXCHANGE TUBES ARRANGED IN SPACED PARALLEL PLANES, EACH TUBE INCLUDING A PLURALITY OF STRAIGHT PARALLEL CONDUITS HAVING INTEGRAL U-BEND CONNECTIONS AT THEIR ENDS; CELLULAR FIN STRUCTURES DISPOSED BETWEEN ADJACENT ONES OF THE TUBES; EACH FIN STRUCTURE COMPRISING CONNECTED WALLS EXTENDING NORMAL TO THE TUBE PLANES, SAID FIN STRUCTURE WALLS HAVING LEADING EDGES AND TRAILING EDGES EQUIPPED WITH NOTCHES WHICH MATE WITH SURFACE PORTIONS OF THE HEAT EXCHANGE TUBES; SUCCESSIVE TUBES HAVING THEIR STRAIGHT CONDUITS OFFSET IN DIRECTIONS PARALLEL TO THE TUBE PLANES, WHEREBY FLUID FLOWING BETWEEN THE STRAIGHT CONDUITS OF ONE TUBE DIRCTELY RUNS INTO THE STRAIGHT CONDUITS IN THE SUCCEEDING TUBE.
Claim 2
Dependent Claim
112 words
A HEAT EXCHANGE UNIT COMPRISING A SERIES OF SERPENTINE HEAT EXCHANGE TUBES ARRANGED IN SPACED PARALLEL PLANES, EACH TUBE INCLUDING A PLURALITY OF STRAIGHT PARALLEL CONDUITS HAVING INTEGRAL U-BEND CONNECTIONS AT THEIR ENDS; CELLULAR FIN STRUCTURES DISPOSED BETWEEN ADJACENT ONES OF THE TUBES; EACH FIN STRUCTURE COMPRISING CONNECTED WALLS EXTENDING NORMAL TO THE TUBE PLANES, SAID FIN STRUCTURE WALLS HAVING LEADING EDGES AND TRAILING EDGES EQUIPPED WITH NOTCHES WHICH MATE WITH SURFACE PORTIONS OF THE HEAT EXCHANGE TUBES; SUCCESSIVE TUBES HAVING THEIR STRAIGHT CONDUITS OFFSET IN DIRECTIONS PARALLEL TO THE TUBE PLANES, WHEREBY FLUID FLOWING BETWEEN THE STRAIGHT CONDUITS OF ONE TUBE DIRCTELY RUNS INTO THE STRAIGHT CONDUITS IN THE SUCCEEDING TUBE.
References Cited (Backward Citations)
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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) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |