Patent US3451820A successfully refreshed from Google Patents.
US3451820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispersions of lipophilic colorcoupling copolymers
Assignee: EIDP Inc
•
Filing: 1965-12-01
•
Granted: 1969-06-24
•
Expires: 1985-12-01
Abstract
No abstract record available.
Inventors
- 👤 Jacob Quentin Umberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:49
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/327; G03C7/3275; D; D21; D21H; D21H21/00; D21H21/14; D21H21/28
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2801171A
Cited
US3163625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |