Patent US2525052A successfully refreshed from Google Patents.
US2525052A
Expired / Lapsed
US
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Colored photographic layers
Assignee: Gevaert Photo Producten NV
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Filing: 1947-05-13
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Granted: 1950-10-10
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Expires: 1967-05-13
Abstract
No abstract record available.
Inventors
- 👤 Auwera Laurent Aloys Van Der
- 👤 Andre Emile Van Dormael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:34
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
40 words
A PHOTOGRAPHIC ANTI-HALATION ELEMENT COMPRISING A GLASS SUPPORT, A LIGHT-SENSITIVE LAYER ON ONE FACE THEREOF, AND A LAYER ON THE OTHER FACE OF THE SUPPORT, SAID SECOND LAYER CONSISTING OF A DYESTUFF ACCORDING TO ONE OF THE FOLLOWING MESOMERIC FORMULAE:
References Cited (Backward Citations)
US2036546A
Cited
US2186731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |