Patent US1885244A successfully refreshed from Google Patents.
Patent US3897418A successfully refreshed from Google Patents.
US3897418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basic dyestuffs
Assignee: Bayer AG
•
Filing: 1973-03-09
•
Granted: 1975-07-29
•
Expires: 1993-03-09
Abstract
Abstract The present invention relates to basic dyestuffs with a dibenzofuran system, their mixtures, processes for their manufacture and their use for dyeing and printing of natural and synthetic materials; particularly of polyacrylonitrile and copolymers of acrylonitrile with other vinyl compounds, and acid modified aromatic polyesters and acid modified polyamides, leather, tanned cotton, cellulose, polyurethanes and for the production of writing liquids and stamping inks.
Inventors
- 👤 Hans-Peter Kuhlthau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:34
CPC Classifications
C; C09; C09B; C09B26/00; C09B26/02; C09B26/04; C09B23/00; C09B23/16; C09B23/162; C09B23/164; D; D06; D06P; D06P3/00; D06P3/70; D06P3/76; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
11 words
DYESTUFF OF THE FORMULA OR MIXTURES OF DYESTUFFS OF THE FORMULA
Claim 2
Dependent Claim
11 words
DYESTUFF OF THE FORMULA OR MIXTURES OF DYESTUFFS OF THE FORMULA
Claim 3
Dependent Claim
11 words
Dyestuff or mixtures of dyestuffs of claim 1 of the formula
Claim 4
Dependent Claim
11 words
Dyestuff or mixtures of dyestuffs of claim 1 of the formula
Claim 5
Dependent Claim
11 words
Dyestuff or mixtures of dyestuffs of claim 1 of the formula
Claim 6
Dependent Claim
11 words
Dyestuff or mixtures of dyestuffs of claim 1 of the formula
Claim 7
Dependent Claim
11 words
Dyestuff or mixtures of dyestuffs of claim 1 of the formula
Claim 8
Dependent Claim
11 words
Dyestuff or mixtures of dyestuffs of claim 1 of the formula
Claim 9
Dependent Claim
11 words
Dyestuff or mixtures of dyestuffs of claim 1 of the formula
Claim 10
Dependent Claim
11 words
Dyestuff or mixtures of dyestuffs of claim 1 of the formula
Claim 11
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
Claim 12
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
Claim 13
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
Claim 14
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
Claim 15
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
Claim 16
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
Claim 17
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
Claim 18
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
Claim 19
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
Claim 20
Dependent Claim
7 words
Mixture of the dyestuffs of the formulae
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |