Patent US2386991A successfully refreshed from Google Patents.
US2804852A
Expired / Lapsed
US
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Water lock boiler feedwater system
Assignee: Individual
•
Filing: 1953-09-22
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Granted: 1957-09-03
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Expires: 1973-09-22
Abstract
No abstract record available.
Inventors
- 👤 Waldo D Nore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:42
CPC Classifications
F; F22; F22D; F22D5/00; F22D5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US461566A
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US558147A
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US844873A
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US987140A
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US1596423A
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FR575620A
Cited
DE579569C
Cited
US2001431A
Cited
US2072467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |