US2730971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace and boiler plant
Assignee: Individual
•
Filing: 1950-08-29
•
Granted: 1956-01-17
•
Expires: 1970-08-29
Abstract
No abstract record available.
Inventors
- 👤 Birkner Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:48
CPC Classifications
F; F23; F23B; F23B1/00; F23B5/00; F23B7/00; F23B2700/00; F23B2700/008; F23B2700/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1898479A
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US1829996A
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US1678827A
Cited
US1624908A
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US1771989A
Cited
GB302471A
Cited
US1863541A
Cited
US2216809A
Cited
US2424587A
Cited
US2380169A
Cited
US2483728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |