US3818718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger for compressed air dryer
Assignee: Individual
•
Filing: 1973-04-26
•
Granted: 1974-06-25
•
Expires: 1993-04-26
Abstract
Abstract A heat exchanger for removing moisture from compressed air and other gases in which the precooling, cooling and reheating sections are in telescoped relation.
Inventors
- 👤 C Freese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:42
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; F; F04; F04B; F04B39/00; F04B39/16; F28; F28D; F28D7/00; F28D7/10; F28D7/103; Y; Y10; Y10S; Y10S165/00; Y10S165/909
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
186 words
Apparatus for dehumidifying air or other gas comprising a plurality of telescoped passageways each having an inlet at one end and an outlet at the opposite end, a first passageway being outermost with its inlet receiving air to be dehumidified, a second passageway being innermost with its inlet receiving the air from the outlet of the first passageway and conducting such air in the opposite direction to the direction of flow in the first passageway and having therein refrigerating means in heat exchange relation to such air, a third passageway surrounding and in heat exchange relation to the second passageway with its inlet receiving the air from the outlet of the second passageway and conducting such air in the same direction as the direction of flow in the first passageway, and a fourth passageway between and in heat exchange relation to the first passageway with its inlet receiving the air from the outlet of the third passageway and conducting such air in the opposite direction to the direction of flow in the first passageway, the flow being sequentially through the first, second, third and fourth passageways.
Claim 2
Dependent Claim
186 words
Apparatus for dehumidifying air or other gas comprising a plurality of telescoped passageways each having an inlet at one end and an outlet at the opposite end, a first passageway being outermost with its inlet receiving air to be dehumidified, a second passageway being innermost with its inlet receiving the air from the outlet of the first passageway and conducting such air in the opposite direction to the direction of flow in the first passageway and having therein refrigerating means in heat exchange relation to such air, a third passageway surrounding and in heat exchange relation to the second passageway with its inlet receiving the air from the outlet of the second passageway and conducting such air in the same direction as the direction of flow in the first passageway, and a fourth passageway between and in heat exchange relation to the first passageway with its inlet receiving the air from the outlet of the third passageway and conducting such air in the opposite direction to the direction of flow in the first passageway, the flow being sequentially through the first, second, third and fourth passageways.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1 in which the third passageway shares a wall with the second passageway and also shares a wall with the fourth passageway.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 in which the fourth passageway shares a wall with the first passageway.
Claim 5
Dependent Claim
70 words
The apparatus of claim 1 having a tank with inlet and outlet fittings, the first passageway being connected to the inlet fitting and formed between the inner surface of a side wall of the tank and a first wall spaced inward from said surface and the fourth passageway being connected to the outlet fitting and formed between said first wall and a second wall spaced inward from said first wall.
Claim 6
Dependent Claim
27 words
The apparatus of claim 4 in which a third wall forms the second passageway and is spaced inward from the second wall to form the third passageway.
Claim 7
Dependent Claim
27 words
The apparatus of claim 5 in which the tank has upper and lower headers and the lower header provides a sump below said second and third walls.
Claim 8
Dependent Claim
17 words
The apparatus of claim 6 in which the sump is refrigerated to provide a further cooling surface.
Claim 9
Dependent Claim
15 words
The apparatus of claim 1 in which the refrigerating means comprises a chilled liquid spray.
Claim 10
Dependent Claim
21 words
The apparatus of claim 1 in which the refrigerating means comprises a conduit carrying in said second passageway a refrigerating medium.
Claim 11
Dependent Claim
24 words
The apparatus of claim 8 in which the chilled liquid is a solution with a freezing point below the normal freezing point of water.
Claim 12
Dependent Claim
21 words
The apparatus of claim 4 in which the first and second walls are supported by a header fixed to the tank.
Claim 13
Dependent Claim
15 words
The apparatus of claim 5 in which the third wall is supported by said header.
Claim 14
Dependent Claim
25 words
The apparatus of claim 5 in which the tank has upper and lower headers and the lower header provides a sump below said third wall.
Claim 15
Dependent Claim
28 words
The apparatus of claim 5 in which the tank has upper and lower headers and the lower header provides a sump below said first, second and third walls.
Claim 16
Dependent Claim
17 words
The apparatus of claim 13 in which the sump is refrigerated to provide a further cooling surface.
Claim 17
Dependent Claim
17 words
The apparatus of claim 14 in which the sump is refrigerated to provide a further cooling surface.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |