US4122117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indandione bis-azomethine pigments
Assignee: DIC Corp
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Filing: 1977-01-18
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Granted: 1978-10-24
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Expires: 1997-01-18
Abstract
Abstract An indandione pigment having high tinting strength and good weatherability and light fastness of the formula <IMAGE> WHEREIN A is a phenylene or naphthylene group optionally substituted by a halogen atom, a lower alkyl group, a lower alkoxy group or a nitro group; n is 2 or 1; and B represents a direct bond or an n valont aromatic radical.
Inventors
- 👤 Hirohito Ando
- 👤 Kouichi Takagi
- 👤 Masao Shukuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:56
CPC Classifications
C; C09; C09B; C09B55/00; C09B55/005; C09B55/007
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
An indandione pigment of the formula ##STR149## wherein A is a phenylene or naphthylene group and B is a phenylene group or the group ##STR150##
Claim 2
Dependent Claim
25 words
An indandione pigment of the formula ##STR149## wherein A is a phenylene or naphthylene group and B is a phenylene group or the group ##STR150##
Claim 3
Dependent Claim
29 words
An indandione pigment of claim 1 wherein A is a phenylene group substituted by a halogen atom, a lower alkyl group, a lower alkoxy group or a nitro group.
Claim 4
Dependent Claim
29 words
An indandione pigment of claim 1 wherein A is a naphthylene group substituted by a halogen atom, a lower alkyl group, a lower alkoxy group or a nitro group.
Claim 5
Dependent Claim
32 words
An indandione pigment of claim 1 wherein B is a phenylene group substituted by a lower alkyl group, a lower alkoxy group, a halogen atom, an acetylamino group or a benzoylamino group.
Claim 6
Dependent Claim
28 words
An indandione pigment of claim 1 wherein B is the group ##STR151## which is substituted by a lower alkyl group, a lower alkoxycarbonyl group or a halogen atom.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |