Patent US2803996A successfully refreshed from Google Patents.
US2803996A
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US
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Objective lens system provided with an aspherical correcting plate
Assignee: Optische Industrie de Oude Delft NV
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Filing: 1953-04-06
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Granted: 1957-08-27
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Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Bouwers Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:14
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0888; G02B13/00; G02B13/18; G02B9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2377268A
Cited
US2332930A
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GB557123A
Cited
US2430150A
Cited
US2378301A
Cited
US2448699A
Cited
GB643659A
Cited
US2596789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |