US4474233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube bundle heat exchanger
Assignee: SIGRI ELEKTROGRAPHIT GmbH
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Filing: 1982-04-08
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Granted: 1984-10-02
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Expires: 2002-04-08
Abstract
Abstract Tube bundle heat exchanger of graphite, in which a multiplicity of graphite tubes are set into the tube sheets and are joined to the sheets by screw or cement joints, characterized by the feature that each tube is surrounded by at least one group of graphite fiber bundles, the latter are connected to the tube in a force-locking manner, and the distance of adjacent fiber bundles is five to ten times the diameter of the graphite fiber bundle.
Inventors
- 👤 Adolf Swozil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:00
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/02; C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; Y; Y10; Y10S; Y10S165/00; Y10S165/906
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
Tube bundle heat exchanger of graphite, comprising a multiplicity of graphite tubes set into tube sheets and joined to the sheets by screw or cement joints, with each tube surrounded by at least one group of graphite fiber bundles, which are connected to the tube in a force-locking manner and with adjacent fiber bundles of the group spaced a distance five to ten times the diameter of the graphite fiber bundle, wherein the fiber bundles are prestressed.
Claim 2
Dependent Claim
77 words
Tube bundle heat exchanger of graphite, comprising a multiplicity of graphite tubes set into tube sheets and joined to the sheets by screw or cement joints, with each tube surrounded by at least one group of graphite fiber bundles, which are connected to the tube in a force-locking manner and with adjacent fiber bundles of the group spaced a distance five to ten times the diameter of the graphite fiber bundle, wherein the fiber bundles are prestressed.
Claim 3
Dependent Claim
24 words
Tube bundle heat exchanger according to claim 1, wherein the force-locking connection between the fiber bundles and the tube consists of acrylic resin bridges.
References Cited (Backward Citations)
US2782806A
Cited
US2807282A
Cited
US4118262A
Cited
US4134451A
Cited
US4244423A
Cited
US4253519A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |