US2565857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for preventing slagging in tubular element gas heating furnaces
Assignee: Aktiengesellschaft fuer Technische Studien
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Filing: 1946-05-15
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Granted: 1951-08-28
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Expires: 1966-05-15
Abstract
No abstract record available.
Inventors
- 👤 Kleiber Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:02
CPC Classifications
F; F23; F23C; F23C9/00; F23C9/003; F02; F02C; F02C1/00; F02C1/04; F02C1/10; F23L; F23L15/00; F23L15/04; F23R; F23R3/00; F23R3/02; F23R3/04; Y; Y02; Y02E; Y02E20/00; Y02E20/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2224544A
Cited
US1574546A
Cited
US1980330A
Cited
US2139367A
Cited
US2174663A
Cited
US2380169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |