Patent US3459464A successfully refreshed from Google Patents.
US3459464A
Expired / Lapsed
US
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Optical dual magnification system
Assignee: Vickers Ltd
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Filing: 1966-01-25
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Granted: 1969-08-05
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Expires: 1986-01-25
Abstract
No abstract record available.
Inventors
- 👤 Francis Hughes Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:57
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02; G02B21/025; G02B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2660922A
Cited
US2835167A
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US2705908A
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DE1100317B
Cited
US2974573A
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US3030857A
Cited
FR1342725A
Cited
US3345912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |