Patent US4522667A successfully refreshed from Google Patents.
Patent US3624941A successfully refreshed from Google Patents.
US3624941A
Expired / Lapsed
US
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Reversible sign element
Assignee: Ferranti Packard Ltd
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Filing: 1969-12-29
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Granted: 1971-12-07
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Expires: 1989-12-29
Abstract
Abstract WITH A MAGNETICALY ACTUABLE REVERSIBLE SIGN ELEMENT A STATIONARY RATCHET ELEMENT LIMITS ROTATION IN ONE DIRECTION AND HOLDS THE ELEMENT AT A POINT WHERE IT MAY ALWAYS BE ROTATED BY REVERSING AN EXTERIOR MAGNETIC FIELD.
Inventors
- 👤 Sydney F Chantry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:02
CPC Classifications
G; G08; G08B; G08B5/00; G08B5/22; G08B5/24; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/375
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |