US2491435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine exhaust steam generator
Assignee: Bituminous Coal Research Inc
•
Filing: 1947-08-06
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Granted: 1949-12-13
•
Expires: 1967-08-06
Abstract
No abstract record available.
Inventors
- 👤 John I Yellott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:01
CPC Classifications
F; F02; F02C; F02C6/00; F02C6/18; B; B60; B60L; B60L50/00; B60L50/10; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F02C3/00; F02C3/20; F02C3/26; B60L2200/00; B60L2200/26; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/70; Y02T10/7072
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1050451A
Cited
US1489501A
Cited
US2076382A
Cited
US2223953A
Cited
US2200379A
Cited
US2262699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |