Patent US3142794A successfully refreshed from Google Patents.
US3147284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anthraquinone dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1962-02-07
•
Granted: 1964-09-01
•
Expires: 1982-02-07
Abstract
No abstract record available.
Inventors
- 👤 Rhyner Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:32
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/503
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
6 words
AN ANTHRAQUINONE DYE OF THE FORMULA
Claim 2
Dependent Claim
6 words
AN ANTHRAQUINONE DYE OF THE FORMULA
Claim 3
Dependent Claim
5 words
A DYESTUFF OF THE FORMULA
Claim 4
Dependent Claim
5 words
A DYESTUFF OF THE FORMULA
References Cited (Backward Citations)
US2321767A
Cited
US2990413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |