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US2721499A
Expired / Lapsed
US
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Five component wide-angle objective
Assignee: Individual
•
Filing: 1952-07-05
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Granted: 1955-10-25
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Expires: 1972-07-05
Abstract
No abstract record available.
Inventors
- 👤 Bertele Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:47
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US435271A
Cited
GB225398A
Cited
DE620538C
Cited
US2031792A
Cited
US2247068A
Cited
US2516724A
Cited
US2628532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-24 | 1959-04-25 | 1959-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-24 | 1963-04-25 | 1963-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-24 | 1967-04-25 | 1967-10-25 | $7700.00 | Window Closed / Lapsed |