US2520924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plotting trainer
Assignee: Individual
•
Filing: 1946-04-24
•
Granted: 1950-09-05
•
Expires: 1966-04-24
Abstract
No abstract record available.
Inventors
- 👤 Cyrus H Fraser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:53
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/24; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4052; G01S7/4082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1278395A
Cited
US1585066A
Cited
GB384971A
Cited
US1915993A
Cited
US1929872A
Cited
US2042174A
Cited
US2191730A
Cited
US2331337A
Cited
US2402162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |