Patent US3905433A successfully refreshed from Google Patents.
Patent US2977340A successfully refreshed from Google Patents.
US2977340A
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US
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Preparation of polyoxamides with trioxides and trihalides of as, sb and bi as catalysts
Assignee: EIDP Inc
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Filing: 1958-04-04
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Granted: 1961-03-28
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Expires: 1978-04-04
Abstract
No abstract record available.
Inventors
- 👤 Bruck Stephen Desiderius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:40
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
THE PROCESS COMPRISING PREPARING A PREPOLYMER HAVING A MOLECULAR WEIGHT OF BETWEEN ABOUT 2,000 AND ABOUT 5,000 BY REACTING AN OXALIC ESTER WITH A DIAMINE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC DIAMINES CONTAINING FROM 4 TO 10 CARBON ATOMS, P-XYLENE DIAMINE,O-XYLENE DIAMINE, 1,4-DIAMINES CONTAIN-E, AND 1,4-DIAMINOETHYLCYCLOHEXANE, AND POLYMERIZING SAID PREPOLYMER TO A POLYMER HAVING AN INHERENT VISCOSITY, AT 25*C. IN A CONCENTRATION OF 0.500 GRAM PER CUBIC CENTIMETER OF METACRESOL GREATER THAN ABOUT 1.0, IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF (1) TRIOXIDES OF ARSENIC, ANTIMONY, AND BISMUTH, AND (2) TRIHALIDES OF ARSENIC, ANTIMONY, AND BISMUTH, EACH HAVING A BOILING POINT ABOVE ABOUT 215*C.
Claim 2
Dependent Claim
110 words
THE PROCESS COMPRISING PREPARING A PREPOLYMER HAVING A MOLECULAR WEIGHT OF BETWEEN ABOUT 2,000 AND ABOUT 5,000 BY REACTING AN OXALIC ESTER WITH A DIAMINE SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC DIAMINES CONTAINING FROM 4 TO 10 CARBON ATOMS, P-XYLENE DIAMINE,O-XYLENE DIAMINE, 1,4-DIAMINES CONTAIN-E, AND 1,4-DIAMINOETHYLCYCLOHEXANE, AND POLYMERIZING SAID PREPOLYMER TO A POLYMER HAVING AN INHERENT VISCOSITY, AT 25*C. IN A CONCENTRATION OF 0.500 GRAM PER CUBIC CENTIMETER OF METACRESOL GREATER THAN ABOUT 1.0, IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF (1) TRIOXIDES OF ARSENIC, ANTIMONY, AND BISMUTH, AND (2) TRIHALIDES OF ARSENIC, ANTIMONY, AND BISMUTH, EACH HAVING A BOILING POINT ABOVE ABOUT 215*C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |