Patent US2425522A successfully refreshed from Google Patents.
US2425522A
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US
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Head-supported binocular magnfier
Assignee: American Optical Corp
•
Filing: 1943-12-18
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Granted: 1947-08-12
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Expires: 1963-12-18
Abstract
No abstract record available.
Inventors
- 👤 Charles A Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:07
CPC Classifications
G; G02; G02B; G02B25/00; G02B25/002; G02B25/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE150172C
Cited
US988081A
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US1033965A
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US1153259A
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FR38627E
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US1835534A
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US1892444A
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US1800558A
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US1838649A
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US2024322A
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US2132670A
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US2270931A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-11 | 1951-02-10 | 1951-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-11 | 1955-02-10 | 1955-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-11 | 1959-02-10 | 1959-08-12 | $7700.00 | Window Closed / Lapsed |