Patent US3439552A successfully refreshed from Google Patents.
US3439552A
Expired / Lapsed
US
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Selective drive device
Assignee: Rolls Royce PLC
•
Filing: 1967-03-06
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Granted: 1969-04-22
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Expires: 1987-03-06
Abstract
No abstract record available.
Inventors
- 👤 Peter Roderick King
- 👤 Dennis Litchfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:43
CPC Classifications
G; G05; G05G; G05G9/00; F; F16; F16H; F16H37/00; F16H2700/00; F16H2700/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87048; Y10T74/00; Y10T74/19; Y10T74/19023; Y10T74/1914; Y10T74/19219; Y10T74/19358; Y10T74/19363
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1322979A
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US843814A
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US1458820A
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US1962942A
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US2233306A
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GB757594A
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US3070974A
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US3273414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |