US2821530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tetrahalogen substituted quinacridones
Assignee: EIDP Inc
•
Filing: 1956-01-04
•
Granted: 1958-01-28
•
Expires: 1976-01-04
Abstract
No abstract record available.
Inventors
- 👤 William S Struve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:28
CPC Classifications
C; C09; C09B; C09B48/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
A NEW COMPOSITION OF MATTER COMPRISING A QUINACRIDONE SELECTED FROM THE GROUP CONSISTING OF SYMMETRICAL TETRAHALO SUBSTITUTED DIHYDRO-QUINACRIDONES AND SYMMETRICAL TETRAHALO SUBSTITUTED LINEAR QUINACRIDONES OF THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
29 words
A NEW COMPOSITION OF MATTER COMPRISING A QUINACRIDONE SELECTED FROM THE GROUP CONSISTING OF SYMMETRICAL TETRAHALO SUBSTITUTED DIHYDRO-QUINACRIDONES AND SYMMETRICAL TETRAHALO SUBSTITUTED LINEAR QUINACRIDONES OF THE FOLLOWING STRUCTURAL FORMULA:
References Cited (Backward Citations)
US2054100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |