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US4125557A
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Hydrosulfite-bleachable ketonimine dyes for paper
Assignee: Wyeth Holdings LLC
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Filing: 1977-11-14
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Granted: 1978-11-14
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Expires: 1997-11-14
Abstract
Abstract Ketonimine dyes of the formula selected from: ##STR1## wherein X⊖ is a chloride, bromide, thiocyanate, sulfamate, formate, acetate, lactate, hydrogen sulfate or dihydrogen phosphate ion; and ##STR2## wherein Y is a sulfate or hydrogen phosphate ion are hydrosulfite bleachable dyes for paper.
Inventors
- 👤 Frank F. Loffelman
- 👤 Frank F. Cesark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:50
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
35 words
A ketonimine dye of the formula selected from ##STR10## wherein X.sup.⊖ is a chloride, bromide, thiocyanate, sulfamate, formate, acetate, lactate, hydrogen sulfate or dihydrogen phosphate ion; and ##STR11## wherein Y is sulfate or hydrogenphosphate ion.
Claim 2
Dependent Claim
35 words
A ketonimine dye of the formula selected from ##STR10## wherein X.sup.⊖ is a chloride, bromide, thiocyanate, sulfamate, formate, acetate, lactate, hydrogen sulfate or dihydrogen phosphate ion; and ##STR11## wherein Y is sulfate or hydrogenphosphate ion.
Claim 3
Dependent Claim
12 words
A ketonimine dye of claim 1 wherein X.sup.⊖ is a chloride ion.
Claim 4
Dependent Claim
12 words
The ketonimine dye of claim 1 wherein X.sup.⊖ is an acetate ion.
Claim 5
Dependent Claim
12 words
The ketonimine dye of claim 1 wherein X.sup.⊖ is a thiocyanate ion.
Claim 6
Dependent Claim
8 words
The compound 4,4'-imidocarbonylbis[N,N-bis(2-hydroxyethyl)aniline] represented by the formula: ##STR12##
Claim 7
Dependent Claim
8 words
The compound 4,4'-imidocarbonylbis[N,N-bis(2-hydroxyethyl)aniline] represented by the formula: ##STR12##
References Cited (Backward Citations)
US3923889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |