Patent US3228953A successfully refreshed from Google Patents.
US3228953A
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Process for the production of anthraquinone dyestuffs
Assignee: Bayer AG
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Filing: 1962-08-02
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Granted: 1966-01-11
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Expires: 1982-08-02
Abstract
No abstract record available.
Inventors
- 👤 Neeff Rutger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:50
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/22; C09B1/36; C09B1/42; C09B5/00; C09B5/02; C09B5/10; C07; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
PROCESS FOR THE PRODUCTION OF ANTHRAQUINONE DYESTUFFS BY A ONE STEP CONDENSATION REACTION COMPRISING CONTACTING NOT LESS THAN 2 MOLS OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ANTHRAQUINONE-2-ALDEHYDE AND THE CORRESPONDING ANIL WITH ABOUT 1 MOL OF 2,5-DIAMINO-1,4-DITHIOBENZOQUINONE.
Claim 2
Dependent Claim
41 words
PROCESS FOR THE PRODUCTION OF ANTHRAQUINONE DYESTUFFS BY A ONE STEP CONDENSATION REACTION COMPRISING CONTACTING NOT LESS THAN 2 MOLS OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ANTHRAQUINONE-2-ALDEHYDE AND THE CORRESPONDING ANIL WITH ABOUT 1 MOL OF 2,5-DIAMINO-1,4-DITHIOBENZOQUINONE.
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |