Patent US2681418A successfully refreshed from Google Patents.
US2681418A
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Steam generator combustion control
Assignee: Leeds and Northrup Co
•
Filing: 1951-07-14
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Granted: 1954-06-15
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Expires: 1971-07-14
Abstract
No abstract record available.
Inventors
- 👤 Edward S Bristol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:24
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/04; H02J3/06; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1583398A
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US1751538A
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US2079165A
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US1935732A
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US2053061A
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US2433725A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |