Patent US2633404A successfully refreshed from Google Patents.
US2633404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine data recorder
Assignee: Individual
•
Filing: 1946-04-22
•
Granted: 1953-03-31
•
Expires: 1966-04-22
Abstract
No abstract record available.
Inventors
- 👤 Claude M Hathaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:06
CPC Classifications
G; G07; G07C; G07C7/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US625537A
Cited
US1316657A
Cited
US1385342A
Cited
US1723228A
Cited
US443360A
Cited
US961288A
Cited
US982021A
Cited
US1236911A
Cited
US1132400A
Cited
US1587639A
Cited
US1455806A
Cited
US1563382A
Cited
US1548960A
Cited
US1886844A
Cited
US1847918A
Cited
US2069152A
Cited
US2214522A
Cited
US2341118A
Cited
US2398133A
Cited
US2391765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |