Patent US2479907A successfully refreshed from Google Patents.
US2479907A
Expired / Lapsed
US
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Optical objective having a front member correcting spherical aberration, field curvature, and distortion
Assignee: Taylor Taylor and Hobson Ltd
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Filing: 1946-05-31
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Granted: 1949-08-23
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Expires: 1966-05-31
Abstract
No abstract record available.
Inventors
- 👤 Cox Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:04
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US697959A
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US880208A
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US934579A
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US1347673A
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US1479229A
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US2100291A
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US2172775A
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US2158202A
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US2394635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-08-22 | 1953-02-21 | 1953-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-08-22 | 1957-02-21 | 1957-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-08-22 | 1961-02-21 | 1961-08-23 | $7700.00 | Window Closed / Lapsed |