Patent US2835168A successfully refreshed from Google Patents.
US2835168A
Expired / Lapsed
US
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Interchangeable lens system for photographic purposes
Assignee: Carl Zeiss AG
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Filing: 1955-08-09
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Granted: 1958-05-20
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Expires: 1975-08-09
Abstract
No abstract record available.
Inventors
- 👤 Lange Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:21
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1651493A
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US1934561A
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US2184018A
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US2169130A
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US2317790A
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US2324057A
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US2612077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |