Patent US2468535A successfully refreshed from Google Patents.
US2468535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for steam boiler
Assignee: —
•
Filing: —
•
Granted: 1949-04-26
•
Expires: 1966-04-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:37
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/02; F23N1/027
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB330052A
Cited
US2143820A
Cited
US1338928A
Cited
US1619253A
Cited
US1853371A
Cited
US2170347A
Cited
US2356135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-25 | 1952-10-25 | 1953-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-25 | 1956-10-25 | 1957-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-25 | 1960-10-25 | 1961-04-26 | $7700.00 | Window Closed / Lapsed |