Patent US3955650A successfully refreshed from Google Patents.
Patent US4346171A successfully refreshed from Google Patents.
Patent US2494811A successfully refreshed from Google Patents.
US2494811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzanthrone dicarboxylic acid compounds
Assignee: BASF Schweiz AG
•
Filing: 1946-07-19
•
Granted: 1950-01-17
•
Expires: 1966-07-19
Abstract
No abstract record available.
Inventors
- 👤 Holbro Theodor
- 👤 Sutter Paul
- 👤 Kern Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:52
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/24; C09B5/34; C09B5/36; C09B3/00; C09B3/02; C09B3/06; C09B3/10; C09B5/02; C09B5/16; C09B5/26; C09B5/28; C09B5/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A VAT DYESTUFF OF THE GENERAL FORMULA
Claim 2
Dependent Claim
7 words
A VAT DYESTUFF OF THE GENERAL FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-16 | 1953-07-18 | 1954-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-16 | 1957-07-18 | 1958-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-16 | 1961-07-18 | 1962-01-17 | $7700.00 | Window Closed / Lapsed |