Patent US3679657A successfully refreshed from Google Patents.
US3679657A
Expired / Lapsed
US
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Monoazo dyestuffs
Assignee: Novartis AG
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Filing: 1969-03-11
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Granted: 1972-07-25
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Expires: 1989-03-11
Abstract
Abstract DYESTUFFS CONTAINING AT LEAST ONE GROUP OF FORMULA -X-CO-NR-SO2, WHEREIN R IS A HYDROGEN ATOM OR AN OPTIONALLY SUBSTITUTED ALKYL, CYCLOALKYL, ARYL, OR HETEROCYCLIC GROUP, AND X IS AN OXYGEN OR SULPHUR ATOM OR A GROUP OF FORMULA -NR1-, WHERE R1 IS A HYDROGEN ATOM OR AN OPTIONALLY SUBSTITUTED ALKYL, CYCLOALKYL, ARYL OR HETEROCYCLIC GROUP.
Inventors
- 👤 Nalin Binduprasad Desai
- 👤 Ponnusami Jayaraman
- 👤 Visvanathan Ramanathan
- 👤 Klaus Artz
- 👤 Navnitrai Nagarji Naik
- 👤 Walter Jenny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:30
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/10; C09B44/101; C09B1/00; C09B1/02; C09B1/16; C09B1/20; C09B1/50; C09B1/54; C09B1/542; C09B1/56; C09B1/58; C09B23/00; C09B23/14; C09B23/143; C09B3/00; C09B3/02; C09B3/06; C09B3/10; C09B39/00; C09B43/00; C09B43/18; C09B43/20; C09B43/206; C09B5/00; C09B51/00; C09B62/00; C09B62/44; C09B62/443; C09B62/78; C09B69/00; C09B69/001
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |