Patent US2922796A successfully refreshed from Google Patents.
US2922796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Yellow sulfonamide dyestuff
Assignee: Celanese Corp
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Filing: 1954-05-17
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Granted: 1960-01-26
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Expires: 1974-05-17
Abstract
No abstract record available.
Inventors
- 👤 Jr John R Adams
- 👤 Victor S Salvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:03
CPC Classifications
C; C09; C09B; C09B51/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
2- NITRO- DIPHENYLAMINE - 4 - SULFON - (N - B - HYDROXYETHYL) ANILIDE.
Claim 2
Dependent Claim
14 words
2- NITRO- DIPHENYLAMINE - 4 - SULFON - (N - B - HYDROXYETHYL) ANILIDE.
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) | 1963-01-25 | 1963-07-27 | 1964-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-25 | 1967-07-27 | 1968-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-25 | 1971-07-27 | 1972-01-26 | $7700.00 | Window Closed / Lapsed |