US2850510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs
Assignee: GAF Chemicals Corp
•
Filing: 1954-08-04
•
Granted: 1958-09-02
•
Expires: 1974-08-04
Abstract
No abstract record available.
Inventors
- 👤 Milton L Hoefle
- 👤 David I Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:24
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/512
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
AN UNSULFONATED COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
6 words
AN UNSULFONATED COMPOUND OF THE FORMULA
References Cited (Backward Citations)
US2611722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |