US2420624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler feed-water system
Assignee: FRED H SCHAUB ENGINEERING CO
•
Filing: 1944-10-21
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Granted: 1947-05-13
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Expires: 1964-10-21
Abstract
No abstract record available.
Inventors
- 👤 Robert F Schaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:20
CPC Classifications
F; F22; F22D; F22D11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US985778A
Cited
US1939415A
Cited
US1988382A
Cited
US1984290A
Cited
US2176230A
Cited
US2366332A
Cited
US2354429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |