US2493548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler level alarm system
Assignee: Individual
•
Filing: 1946-05-27
•
Granted: 1950-01-03
•
Expires: 1966-05-27
Abstract
No abstract record available.
Inventors
- 👤 William E Proctor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:46
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/42; F22B37/426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US841186A
Cited
US1221963A
Cited
US1689294A
Cited
US2116947A
Cited
US2129261A
Cited
GB475248A
Cited
US2368471A
Cited
US2456286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |