Patent US3169428A successfully refreshed from Google Patents.
US3504610A
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Method and apparatus for automatically focussing optical devices
Assignee: Voigtlander AG
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Filing: 1966-02-28
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Granted: 1970-04-07
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Expires: 1986-02-28
Abstract
No abstract record available.
Inventors
- 👤 Dieter Donitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:00
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2134757A
Cited
US2339780A
Cited
US2524807A
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GB735743A
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GB735747A
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US2968994A
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US3185059A
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DE1231445B
Cited
US3274913A
Cited
DE1210672B
Cited
US3336851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |