US2455808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Objective of low index glass with negative components of high curvature
Assignee: Eastman Kodak Co
•
Filing: 1944-06-30
•
Granted: 1948-12-07
•
Expires: 1964-06-30
Abstract
No abstract record available.
Inventors
- 👤 Reiss Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:34
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US583336A
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GB165657A
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US1394078A
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US1584272A
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US1541407A
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US1786916A
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US2085437A
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US2117252A
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US2143813A
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US2271227A
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US2319171A
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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) | 1951-12-07 | 1952-06-07 | 1952-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-07 | 1956-06-07 | 1956-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-07 | 1960-06-07 | 1960-12-07 | $7700.00 | Window Closed / Lapsed |