Patent US2457543A successfully refreshed from Google Patents.
US2457543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical sighting device having re
Assignee: —
•
Filing: —
•
Granted: 1948-12-28
•
Expires: 1965-12-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:46
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/02; G02B23/08; G02B23/10; G02B23/105
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2378937A
Cited
US784852A
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US873228A
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US1186707A
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US1479036A
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US1559716A
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US1744994A
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US2039878A
Cited
US2184615A
Cited
US2152726A
Cited
US2372192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |