US3933862A
Expired / Lapsed
US
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Aromatic dithio dianhydrides
Assignee: General Electric Co
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Filing: 1974-08-23
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Granted: 1976-01-20
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Expires: 1994-08-23
Abstract
Abstract There are provided bis(thioether) aromatic dianhydrides and method for making these materials. A bisthiol in the presence of base, or bisthiol basic salt, can be reacted with a nitro- or halo-substituted phthalic compound, such as an anhydride or anhydride precursor. These aromatic dithiodianhydrides can be used to make polyimides and polyesters, and can be used as curing agents for epoxy resins.
Inventors
- 👤 Frank J. Williams, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:16
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C07C; C07C323/00; C07D307/00; C07D307/77; C07D307/87; C07D307/89; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/423
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A dithioanhydride having the formula ##SPC22## where R is a radical selected from the class consisting of ##SPC23## and divalent organic radicals of the general formula ##SPC24## where X is a member selected from the class consisting of divalent radicals of the formulas, --C y H 2y --, ##EQU2## --O--, and --S--, where m is 0 or 1, y is a whole number from 1 to 5.
Claim 2
Dependent Claim
67 words
A dithioanhydride having the formula ##SPC22## where R is a radical selected from the class consisting of ##SPC23## and divalent organic radicals of the general formula ##SPC24## where X is a member selected from the class consisting of divalent radicals of the formulas, --C y H 2y --, ##EQU2## --O--, and --S--, where m is 0 or 1, y is a whole number from 1 to 5.
Claim 3
Dependent Claim
4 words
The compound 2,2-bis[4-(2,3-dicarboxythiophenoxy)phenyl]propane dianhydride.
Claim 4
Dependent Claim
4 words
The compound 2,2-bis[4-(2,3-dicarboxythiophenoxy)phenyl]propane dianhydride.
Claim 5
Dependent Claim
5 words
The compound 2,4-bis[2,3-dicarboxyphenylthio] chlorobenzene dianhydride.
Claim 6
Dependent Claim
5 words
The compound 2,4-bis[2,3-dicarboxyphenylthio] chlorobenzene dianhydride.
Claim 7
Dependent Claim
5 words
The compound 4,4'-bis[2,3-dicarboxyphenylthio] diphenylether dianhydride.
Claim 8
Dependent Claim
5 words
The compound 4,4'-bis[2,3-dicarboxyphenylthio] diphenylether dianhydride.
Claim 9
Dependent Claim
5 words
The compound 4,4'-bis[2,3-dicarboxyphenylthio] biphenyl dianhydride.
Claim 10
Dependent Claim
5 words
The compound 4,4'-bis[2,3-dicarboxyphenylthio] biphenyl dianhydride.
References Cited (Backward Citations)
DE2155431A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |