Patent US3366437A successfully refreshed from Google Patents.
US3366437A
Expired / Lapsed
US
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Zoom lens having two movable negative lens members disposed between two positive lens members
Assignee: Sankyo Kogaku Kogyo Co Ltd
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Filing: 1964-03-16
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Granted: 1968-01-30
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Expires: 1984-03-16
Abstract
No abstract record available.
Inventors
- 👤 Moriyama Hisao
- 👤 Ito Akio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:59
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/144; G02B15/1441; G02B15/144109
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2847907A
Cited
US3027805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-29 | 1971-07-31 | 1972-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-29 | 1975-07-31 | 1976-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-29 | 1979-07-31 | 1980-01-30 | $7700.00 | Window Closed / Lapsed |