US2803720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed rotary switching apparatus
Assignee: Individual
•
Filing: 1954-04-20
•
Granted: 1957-08-20
•
Expires: 1974-04-20
Abstract
No abstract record available.
Inventors
- 👤 Mason Charles Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:45
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB545818A
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US1870032A
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US878467A
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US958509A
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US1530936A
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US1529470A
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US1706523A
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FR720957A
Cited
US2283340A
Cited
US2310357A
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US2310138A
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US2448779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |