US2779230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system providing a long optical path
Assignee: Individual
•
Filing: 1951-07-20
•
Granted: 1957-01-29
•
Expires: 1971-07-20
Abstract
No abstract record available.
Inventors
- 👤 John U White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:25
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/65; G01N2021/651
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US883868A
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US1252512A
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US1783998A
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US1813673A
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US1848874A
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US1999867A
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DE668449C
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US2356274A
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US2402856A
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US2562181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |