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Patent US2573512A successfully refreshed from Google Patents.
US2573512A
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Four-lens triplet type photographic objective
Assignee: Voigtlander AG
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Filing: 1949-11-17
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Granted: 1951-10-30
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Expires: 1969-11-17
Abstract
No abstract record available.
Inventors
- 👤 Tronnier Albrecht Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:11
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB146211A
Cited
US1558073A
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US1741947A
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US1924527A
Cited
US1849681A
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US2084714A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |