US2505533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monoazo-dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1946-09-04
•
Granted: 1950-04-25
•
Expires: 1966-09-04
Abstract
No abstract record available.
Inventors
- 👤 Felix Friedrich
- 👤 Mueller Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:00
CPC Classifications
C; C09; C09B; C09B29/00; C09B29/24; C09B29/28; C09B29/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A MONOAZO DYESTUFF WHICH IN THE FREE STATE CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
12 words
A MONOAZO DYESTUFF WHICH IN THE FREE STATE CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
DE221491C
Cited
GB190923204A
Cited
GB190914820A
Cited
GB191000369A
Cited
GB424355A
Cited
US2156593A
Cited
GB502309A
Cited
US2205848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-24 | 1953-10-24 | 1954-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-24 | 1957-10-24 | 1958-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-24 | 1961-10-24 | 1962-04-25 | $7700.00 | Window Closed / Lapsed |