Patent US3547811A successfully refreshed from Google Patents.
Patent US2420636A successfully refreshed from Google Patents.
US2420636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic masking
Assignee: Eastman Kodak Co
•
Filing: 1942-04-11
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Granted: 1947-05-13
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Expires: 1962-04-11
Abstract
No abstract record available.
Inventors
- 👤 John A C Yule
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:09
CPC Classifications
G; G03; G03F; G03F3/00; G03F3/04; G03F3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE80038C
Cited
US774549A
Cited
US812748A
Cited
US1356442A
Cited
DE365498C
Cited
DE405764C
Cited
US1677965A
Cited
US1725395A
Cited
DE532233C
Cited
US1899962A
Cited
US1960373A
Cited
US2183598A
Cited
US2083215A
Cited
GB494341A
Cited
US2193931A
Cited
US2340656A
Cited
US2179786A
Cited
US2241413A
Cited
US2208275A
Cited
US2246561A
Cited
US2281033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |