Patent US4413131A successfully refreshed from Google Patents.
US4413131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4,5,6,7-Tetrahalo-isoindolin-1-one derivatives
Assignee: Fidelity Union Bank
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Filing: 1977-07-11
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Granted: 1983-11-01
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Expires: 1997-07-11
Abstract
Abstract Disclosed are compounds of formula I, ##STR1## in which the R 1 's, independently, are chlorine or bromine, and R 2 is fluorine, chlorine, bromine, methyl, ethyl, ethoxy or tri-fluoromethyl, their production and use as pigments.
Inventors
- 👤 Dimitrios Karanatsios
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:08
CPC Classifications
C; C09; C09B; C09B57/00; C09B57/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
6 words
A compound of the formula ##STR6##
Claim 2
Dependent Claim
6 words
A compound of the formula ##STR6##
Claim 3
Dependent Claim
6 words
A compound of the formula ##STR7##
Claim 4
Dependent Claim
6 words
A compound of the formula ##STR7##
Claim 5
Dependent Claim
6 words
A compound of the formula ##STR8##
Claim 6
Dependent Claim
6 words
A compound of the formula ##STR8##
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |