Patent US2827356A successfully refreshed from Google Patents.
US2827356A
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US
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Anthraquinone dyestuffs
Assignee: Celanese Corp
•
Filing: 1952-10-20
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Granted: 1958-03-18
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Expires: 1972-10-20
Abstract
No abstract record available.
Inventors
- 👤 Victor S Salvin
- 👤 Ruth A Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:45
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/51; C09B1/514; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
AN ANTHRAQUINONE DYESTUFF MIXTURE COMPRISING ABOUT 1 TO 3 PARTS OF 1,5-DIHYDROXY-4-(METHYL CARBINOL)ANILINO-8-NITRO ANTHRAQUINONE AND 1 TO 3 PARTS OF 1,8DIHYDROXY-4-(M-METHYL CARBINOL)-ANILINO-5-NITRO ANTHRAQQUINONE.
Claim 2
Dependent Claim
23 words
AN ANTHRAQUINONE DYESTUFF MIXTURE COMPRISING ABOUT 1 TO 3 PARTS OF 1,5-DIHYDROXY-4-(METHYL CARBINOL)ANILINO-8-NITRO ANTHRAQUINONE AND 1 TO 3 PARTS OF 1,8DIHYDROXY-4-(M-METHYL CARBINOL)-ANILINO-5-NITRO ANTHRAQQUINONE.
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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) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |