US2515723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dibenzanthrone dyestuff
Assignee: GAF Chemicals Corp
•
Filing: 1947-10-01
•
Granted: 1950-07-18
•
Expires: 1967-10-01
Abstract
No abstract record available.
Inventors
- 👤 Max Fritz
- 👤 Nickels Wilhelm Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:20
CPC Classifications
C; C09; C09B; C09B3/00; C09B3/22; C09B3/30; C09B3/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
7 words
A VAT DYESTUFF HAVING THE FOLLOWING FORMULA:
References Cited (Backward Citations)
US2218663A
Cited
US2318266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |