US2777879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing triaminodiphenyl ethers
Assignee: EIDP Inc
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Filing: 1956-01-24
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Granted: 1957-01-15
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Expires: 1976-01-24
Abstract
No abstract record available.
Inventors
- 👤 Spiegler Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:30
CPC Classifications
C; C07; C07C; C07C213/00; C07C213/02; C07C209/00; C07C209/04; C07C209/06; C07C209/10; C07C209/30; C07C209/32; C07C209/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE PROCESS FOR PREPARING A TRIAMINODIPHENYL ETHER BY REACTING A DINITROHALOBENZENE TAKEN FROM THE GROUP CONSISTING OF 2,4-DINITROHALOBENZENE AND 2,6-DINITROHALOBENZENE WITH AN ALKALI METAL SALT OF A NITROPHENOL TO FORM A TRINITRODIPHENYL ETHER FOLLOWED BY CATALYTIC HYDROGENATION OF SAID TRINITRODIPHENYL ETHER, THE IMPROVEMENT WHEREIN SAID TRINIRODIPHENYL ETHER IS PREPARED IN AQUEOUS DIOXANE RESULTING IN AN AQUEOUS SALT LAYER AND A DIOXANE LAYER, SAID LAYERS BEING SEPARATED, SAID DIOXANE LAYER CONTAINING TRINITRODIPHENYL ETHER THEN BEING CATALYTICALLY HYDROGENATED TO YIELD THE CORRESPONDING TRIAMINODIPHENYL ETHER AND AQUEOUS DIOXANE, SAID AQUEOUS DIOXANE THEN BEING RECOVERED BY DISTIALLATION FROM SAID TRIAMINODIPHENYL ETHER AND RECYCLED FOR USE IN THE PREPARATION OF SAID TRINITRODIPHENYL ETHER.
Claim 2
Dependent Claim
109 words
IN THE PROCESS FOR PREPARING A TRIAMINODIPHENYL ETHER BY REACTING A DINITROHALOBENZENE TAKEN FROM THE GROUP CONSISTING OF 2,4-DINITROHALOBENZENE AND 2,6-DINITROHALOBENZENE WITH AN ALKALI METAL SALT OF A NITROPHENOL TO FORM A TRINITRODIPHENYL ETHER FOLLOWED BY CATALYTIC HYDROGENATION OF SAID TRINITRODIPHENYL ETHER, THE IMPROVEMENT WHEREIN SAID TRINIRODIPHENYL ETHER IS PREPARED IN AQUEOUS DIOXANE RESULTING IN AN AQUEOUS SALT LAYER AND A DIOXANE LAYER, SAID LAYERS BEING SEPARATED, SAID DIOXANE LAYER CONTAINING TRINITRODIPHENYL ETHER THEN BEING CATALYTICALLY HYDROGENATED TO YIELD THE CORRESPONDING TRIAMINODIPHENYL ETHER AND AQUEOUS DIOXANE, SAID AQUEOUS DIOXANE THEN BEING RECOVERED BY DISTIALLATION FROM SAID TRIAMINODIPHENYL ETHER AND RECYCLED FOR USE IN THE PREPARATION OF SAID TRINITRODIPHENYL ETHER.
References Cited (Backward Citations)
US2175003A
Cited
US2440530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |