US2797899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating double shell heat exchange drum means and method of operating same
Assignee: Lukens Steel Co
•
Filing: 1952-12-11
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Granted: 1957-07-02
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Expires: 1972-12-11
Abstract
No abstract record available.
Inventors
- 👤 William H Funk
- 👤 George L Snyder
- 👤 Robert E White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:06
CPC Classifications
F; F28; F28D; F28D11/00; F28D11/02; B; B01; B01J; B01J19/00; B01J19/28; F28F; F28F5/00; F28F5/02; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1897613A
Cited
US1995011A
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US2576036A
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US2521215A
Cited
US2538985A
Cited
US2582365A
Cited
US2703224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |