US2904433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing antihalation and filter layers
Assignee: Agfa Gevaert NV
•
Filing: 1951-05-04
•
Granted: 1959-09-15
•
Expires: 1971-05-04
Abstract
No abstract record available.
Inventors
- 👤 Ludwig Max Coenen
- 👤 Ottmar Wahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:02
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A PHOTOGRAPHIC LIGHT SENSITIVE SILVER HALIDE MATERIAL PROVIDED WITH A FILTER COATING COMPRISING A TRIPHENYL METHANE DYESTUFF SAID TRIPHENYL METHANE DYESTYUFF CORRESPONDING TO THE GENERAL FORMULA
Claim 2
Dependent Claim
26 words
A PHOTOGRAPHIC LIGHT SENSITIVE SILVER HALIDE MATERIAL PROVIDED WITH A FILTER COATING COMPRISING A TRIPHENYL METHANE DYESTUFF SAID TRIPHENYL METHANE DYESTYUFF CORRESPONDING TO THE GENERAL FORMULA
References Cited (Backward Citations)
US310128A
Cited
US567567A
Cited
US1470555A
Cited
US707813A
Cited
US676555A
Cited
US1588052A
Cited
US1772523A
Cited
US2039571A
Cited
GB446583A
Cited
US2098891A
Cited
US2083888A
Cited
US2055607A
Cited
US2282890A
Cited
FR930168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |