US2424256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color developers comprising arylsulfonhydrazides and methods of developing with same
Assignee: GAF Chemicals Corp
•
Filing: 1945-01-26
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Granted: 1947-07-22
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Expires: 1965-01-26
Abstract
No abstract record available.
Inventors
- 👤 Willy A Schmidt
- 👤 Joseph A Sprung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:30
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1934011A
Cited
GB462140A
Cited
US2266442A
Cited
US2196734A
Cited
US2191037A
Cited
US2304025A
Cited
US2276254A
Cited
US2339213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-21 | 1951-01-20 | 1951-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-21 | 1955-01-20 | 1955-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-21 | 1959-01-20 | 1959-07-22 | $7700.00 | Window Closed / Lapsed |