US2679979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler load control
Assignee: Leeds and Northrup Co
•
Filing: 1950-03-24
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Granted: 1954-06-01
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Expires: 1970-03-24
Abstract
No abstract record available.
Inventors
- 👤 Edward S Bristol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:37
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/08; F23N1/10; F23N1/105; F23N2225/00; F23N2225/04; F23N2225/06; F23N2235/00; F23N2235/02; F23N2235/06; F23N2235/12; F23N2235/14; F23N2237/00; F23N2237/02; F23N5/00; F23N5/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1967988A
Cited
US2259417A
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US2328499A
Cited
US2052375A
Cited
US2047234A
Cited
US2218454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |