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Patent US2420501A successfully refreshed from Google Patents.
US2420501A
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Electric follow-up system
Assignee: Simmonds Aerocessories Inc
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Filing: 1943-10-13
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Granted: 1947-05-13
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Expires: 1963-10-13
Abstract
No abstract record available.
Inventors
- 👤 Smith Stanley James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:57
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; H; H02; H02P; H02P7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US559904A
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US2356152A
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US1800328A
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US1932073A
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US1901685A
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US2168032A
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US2317258A
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US2351316A
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US2311462A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |