US2443556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermittent combustion hot-air
Assignee: —
•
Filing: —
•
Granted: 1948-06-15
•
Expires: 1965-06-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:44
CPC Classifications
—
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1931083A
Cited
USRE21515E
Cited
US1733792A
Cited
US1263654A
Cited
US1957669A
Cited
US2146397A
Cited
US2137581A
Cited
US2308888A
Cited
US2330298A
Cited
US2396655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-15 | 1951-12-15 | 1952-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-15 | 1955-12-15 | 1956-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-15 | 1959-12-15 | 1960-06-15 | $7700.00 | Window Closed / Lapsed |