Patent US3720693A successfully refreshed from Google Patents.
US3720693A
Expired / Lapsed
US
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Anthraquinone dyestuffs
Assignee: Bayer AG
•
Filing: 1970-02-06
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Granted: 1973-03-13
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Expires: 1990-02-06
Abstract
Abstract IN WHICH R is a substituent; p is a number 0-6; and n is 1 or 2; their production and use as pigments are disclosed. Anthraquinone dyestuffs of the formula
Inventors
- 👤 K Peters
- 👤 R Neeff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:41
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/50; C09B1/16; C09B1/20; C09B1/36; C09B1/42; C09B1/56; C09B1/58
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
5 words
Anthraquinone dyestuff of the formula
Claim 2
Dependent Claim
5 words
Anthraquinone dyestuff of the formula
Claim 3
Dependent Claim
5 words
Anthraquinone dyestuff of the formula
Claim 4
Dependent Claim
5 words
Anthraquinone dyestuff of the formula
Claim 5
Dependent Claim
10 words
Anthraquinone dyestuff of claim 2 in which p is 0.
Claim 6
Dependent Claim
5 words
Anthraquinone dyestuff of the formula
Claim 7
Dependent Claim
5 words
Anthraquinone dyestuff of the formula
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |