US2820787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone azo dye
Assignee: GAF Chemicals Corp
•
Filing: 1954-08-04
•
Granted: 1958-01-21
•
Expires: 1974-08-04
Abstract
No abstract record available.
Inventors
- 👤 David I Randall
- 👤 Nicholas W Solonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:40
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A DYESTUFF HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
A DYESTUFF HAVING THE FORMULA
References Cited (Backward Citations)
US1028139A
Cited
GB542213A
Cited
CH226629A
Cited
GB673226A
Cited
CH279523A
Cited
FR1057593A
Cited
DE883018C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |