Patent US2855819A successfully refreshed from Google Patents.
US2855819A
Expired / Lapsed
US
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Composite prisms and prismatic magnification systems comprising same
Assignee: Eastman Kodak Co
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Filing: 1955-09-01
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Granted: 1958-10-14
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Expires: 1975-09-01
Abstract
No abstract record available.
Inventors
- 👤 Benjamin E Luboshez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:00
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/08; G02B13/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1610581A
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US1811946A
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US1937342A
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US1932082A
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US2088660A
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FR1091814A
Cited
FR1101419A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |