Patent US2552280A successfully refreshed from Google Patents.
US2552280A
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Episcopic illuminator for optical projection comparators
Assignee: Eastman Kodak Co
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Filing: 1948-12-09
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Granted: 1951-05-08
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Expires: 1968-12-09
Abstract
No abstract record available.
Inventors
- 👤 Robert J Hudak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:33
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/0004; G02B21/0016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2230573A
Cited
US2103230A
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US2373928A
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US2373930A
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US2414867A
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US2409328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |