Patent US2566247A successfully refreshed from Google Patents.
US2566247A
Expired / Lapsed
US
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Plotter
Assignee: Individual
•
Filing: 1945-06-14
•
Granted: 1951-08-28
•
Expires: 1965-06-14
Abstract
No abstract record available.
Inventors
- 👤 Pierce Firth
- 👤 Jr George A Brettell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:24
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20; G01C21/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191514379A
Cited
US1433070A
Cited
US1437400A
Cited
US1743781A
Cited
GB384971A
Cited
US2063534A
Cited
US1985265A
Cited
GB458274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |