US2495244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester-like derivatives of azo dyestuffs
Assignee: BASF Schweiz AG
•
Filing: 1945-09-20
•
Granted: 1950-01-24
•
Expires: 1965-09-20
Abstract
No abstract record available.
Inventors
- 👤 Felix Friedrich
- 👤 Heckendorn Alphonse
- 👤 Reich Ernst
- 👤 Oesterlein Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:13
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/18; C09B43/20; C09B43/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
AN ESTER-LIKE MONOAZO DYESTUFF DERIVATIVE WHICH CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
10 words
AN ESTER-LIKE MONOAZO DYESTUFF DERIVATIVE WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
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US2095600A
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US2120741A
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US2170262A
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US2199048A
Cited
US2276187A
Cited
US2237483A
Cited
US2249956A
Cited
US2274544A
Cited
US2359862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |