Patent US2493770A successfully refreshed from Google Patents.
US2493770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
manning
Assignee: —
•
Filing: —
•
Granted: 1950-01-10
•
Expires: 1967-01-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:05
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1761361A
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US1939597A
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Cited
US2089901A
Cited
US2389155A
Cited
US2406550A
Cited
US2392781A
Cited
US2374991A
Cited
US2410725A
Cited
US2388858A
Cited
US2424011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |