US2769371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephoto objective lens comprising four elements
Assignee: WOLLENSAK OPTICAL CO
•
Filing: 1955-07-25
•
Granted: 1956-11-06
•
Expires: 1975-07-25
Abstract
No abstract record available.
Inventors
- 👤 David C Gilkeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:09
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US873898A
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US1480929A
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US1573999A
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US1897896A
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US2231699A
Cited
US2346312A
Cited
US2421927A
Cited
US2543354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |