US2789975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuffs of the pyrazolone series
Assignee: Saul and Co
•
Filing: 1954-05-17
•
Granted: 1957-04-23
•
Expires: 1974-05-17
Abstract
No abstract record available.
Inventors
- 👤 Ruckstuhl Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:31
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
AN AZO DYESTUFF OF THE PYRAZOLONE SERIES SELECTED FROM THE CLASS CONSISTING OF THE MONOAZO DYESTUFFS CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
20 words
AN AZO DYESTUFF OF THE PYRAZOLONE SERIES SELECTED FROM THE CLASS CONSISTING OF THE MONOAZO DYESTUFFS CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
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Cited
US2109024A
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US2228288A
Cited
US2439798A
Cited
US2457823A
Cited
US2565898A
Cited
US2512251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |