Patent US2423371A successfully refreshed from Google Patents.
US2423371A
Expired / Lapsed
US
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Polartoscope
Assignee: Individual
•
Filing: 1944-07-26
•
Granted: 1947-07-01
•
Expires: 1964-07-26
Abstract
No abstract record available.
Inventors
- 👤 Carranza Eduardo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:49
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/02; G02B27/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US151005A
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US163173A
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US1690602A
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US1662743A
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US1885642A
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US2038909A
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US2152424A
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US2256093A
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US2184138A
Cited
US2263684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-30 | 1950-12-30 | 1951-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-30 | 1954-12-30 | 1955-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-30 | 1958-12-30 | 1959-07-01 | $7700.00 | Window Closed / Lapsed |