Patent US1287457A successfully refreshed from Google Patents.
Patent US3782450A successfully refreshed from Google Patents.
US3782450A
Expired / Lapsed
US
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Heat exchanger with nests of tubes
Assignee: Sigri Elektrographit dt GmbH
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Filing: 1972-04-06
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Granted: 1974-01-01
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Expires: 1992-04-06
Abstract
Abstract Heat exchanger with nests of tubes having tube plates consisting of graphite. The tubes are cemented into recesses or holes of the tube plates. The depth of the recess is greater, preferably at least twice as great, as the height of the cement layer. The remaining ring gap is filled with substances in powder form or with such substances which do not bond with the cement mass.
Inventors
- 👤 A Swozil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:58
CPC Classifications
F; F28; F28F; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/162; F28F21/00; F28F21/02; Y; Y10; Y10S; Y10S159/00; Y10S159/15; Y10S165/00; Y10S165/051; Y10S165/052; Y10S165/063; Y10S285/00; Y10S285/915
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
A heat exchanger comprising a plurality of graphite tubes, a graphite plate arranged transversely of the tubes and having recesses each of which receive an end of a respective one of the tubes, the relative diameters of the ends of the tubes and the recesses being such that an annular space is defined between the end of each of the tubes and the recess in which the tube is received, a cement substance filling each annular space and cementing the tube into the recess over only a portion of the axial dimension of the annular space beginning at the free end of the tube, the remainder of the axial dimension of the annular space being free over at least a portion of its radial dimension.
Claim 2
Dependent Claim
125 words
A heat exchanger comprising a plurality of graphite tubes, a graphite plate arranged transversely of the tubes and having recesses each of which receive an end of a respective one of the tubes, the relative diameters of the ends of the tubes and the recesses being such that an annular space is defined between the end of each of the tubes and the recess in which the tube is received, a cement substance filling each annular space and cementing the tube into the recess over only a portion of the axial dimension of the annular space beginning at the free end of the tube, the remainder of the axial dimension of the annular space being free over at least a portion of its radial dimension.
Claim 3
Dependent Claim
44 words
A heat exchanger according to claim 1, in which the portion of the annular space which is filled by the cement substance extends from the free end of the tube a distance no greater than one-half the total axial dimension of the annular space.
Claim 4
Dependent Claim
51 words
A heat exchanger according to claim 1, in which the remainder of the axial dimension of the annular space contains the cement substance over only a portion of its radial dimension beginning at and adhering to the wall of the tube or the wall of the recess defining the annular space.
References Cited (Backward Citations)
CA538135A
Cited
US1992504A
Cited
US2956787A
Cited
US3182720A
Cited
US3327777A
Cited
US3701548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |