US2561933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensated furnace chamber enclosure structure
Assignee: Individual
•
Filing: 1948-05-22
•
Granted: 1951-07-24
•
Expires: 1968-05-22
Abstract
No abstract record available.
Inventors
- 👤 Levi S Longenecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:43
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/0003; F27D1/0023; F27D1/0026; F27D1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1123874A
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US1410729A
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US1807868A
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US1929073A
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US1946083A
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US2148054A
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US2319065A
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US2462289A
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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) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |