Patent US2290772A successfully refreshed from Google Patents.
US2290772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic regulating system for pressure-fired steam generators or the like
Assignee: BBC Brown Boveri AG Germany
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Filing: 1938-09-28
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Granted: 1942-07-21
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Expires: 1958-09-28
Abstract
No abstract record available.
Inventors
- 👤 Seippel Claude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:21
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/14; G05D16/18; F; F01; F01D; F01D17/00; F01D17/10; F05; F05D; F05D2220/00; F05D2220/70; F05D2220/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-07-20 | 1946-01-19 | 1946-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-07-20 | 1950-01-19 | 1950-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-07-20 | 1954-01-19 | 1954-07-21 | $7700.00 | Window Closed / Lapsed |