Patent US3536379A successfully refreshed from Google Patents.
US3536379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three lens objective with good correction of the secondary spectrum
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1967-04-18
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Granted: 1970-10-27
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Expires: 1987-04-18
Abstract
No abstract record available.
Inventors
- 👤 Georg Knetsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:02
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/12; G02B13/00; G02B27/00; G02B27/0025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |