Patent US3438713A successfully refreshed from Google Patents.
US3438713A
Expired / Lapsed
US
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Device for measuring or testing the image forming quality of lens systems
Assignee: Carl Zeiss AG
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Filing: 1964-03-20
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Granted: 1969-04-15
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Expires: 1984-03-20
Abstract
No abstract record available.
Inventors
- 👤 Erich Heynacher
- 👤 Erwin Wiedmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:25
CPC Classifications
G; G01; G01M; G01M11/00; G01M11/02; G01M11/0292
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2625072A
Cited
DE931442C
Cited
US2771004A
Cited
US3193690A
Cited
DE1131913B
Cited
US3277245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |