US1839927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recuperator or regenerator use of gases from high frequency furnaces
Assignee: Ajax Metal Co
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Filing: 1928-09-19
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Granted: 1932-01-05
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Expires: 1948-09-19
Abstract
No abstract record available.
Inventors
- 👤 Neuhauss Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:41
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/08; F27B17/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-01-04 | 1935-07-06 | 1936-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-01-04 | 1939-07-06 | 1940-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-01-04 | 1943-07-06 | 1944-01-05 | $7700.00 | Window Closed / Lapsed |