US2835230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler
Assignee: Cleaver Brooks Co
•
Filing: 1954-01-11
•
Granted: 1958-05-20
•
Expires: 1974-01-11
Abstract
No abstract record available.
Inventors
- 👤 John C Cleaver
- 👤 Frederick A Loebel
- 👤 John F Horvath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:07
CPC Classifications
F; F22; F22B; F22B33/00; F22B33/02; F22B33/08; F22B37/00; F22B37/02; F22B37/22; F22B37/221; F23; F23M; F23M7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US479991A
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US1615789A
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US1977478A
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US1940973A
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GB415357A
Cited
US2192346A
Cited
US2464701A
Cited
US2541567A
Cited
US2535324A
Cited
US2576053A
Cited
US2682861A
Cited
US2604081A
Cited
US2595523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |