Patent US2704282A successfully refreshed from Google Patents.
US2704282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyoxamides of 3-alkoxyhexamethylenediamines
Assignee: EIDP Inc
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Filing: 1952-06-14
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Granted: 1955-03-15
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Expires: 1972-06-14
Abstract
No abstract record available.
Inventors
- 👤 Gelu S Stamatoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:09
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR PREPARING POLYMERS WHICH COMPRISES PREPARING A PREPOLYMER BY REACTION BETWEEN A 3-ALKOXYHEXAMETHYLENEDIAMINE OF THE CLASS CONSISTING OF 3METHOXYHEXAMETHYLENEDIAMINE, 3-ETHOXYAMETHYLENEDIAMINE, AND 3-ISOBUTOXYHEXAMETHYLENEDIAMINE AND A DIALKYL OXALATE ESTER IN WHICH THE ALKYL GROUPS CONTAIN FROM 1 TO 4 CARBON ATOMS AT A TEMPERATURE WITHIN THE RANGE OF-7* C. TO &150* C. IN THE PRESENCE OF AN INERT ORGANIC DILUENT, SEPARATING THE RESULTING PREPOLYMER HAVING AN INHERENT VISCOSITY WITHIN THE RANGE OF 0.25 TO 0.50 FROM THE RESULTING MIXTURE AND THEREAFTER CONVERTING THE SAID PREPOLYMER TO A POLYMER HAVING AN INHERENT VISCOSITY WITHIN THE RANGE OF 0.9 TO 1.4 BY HEATING THE SAID PREPOLYMER IN AN OXYGEN-FREE ATMOSPHERE IN THE MOLTEN STATE AT A TEMPERATURE BELOW ITS THERMAL DECOMPOSITION TEMPERATURE.
Claim 2
Dependent Claim
120 words
A PROCESS FOR PREPARING POLYMERS WHICH COMPRISES PREPARING A PREPOLYMER BY REACTION BETWEEN A 3-ALKOXYHEXAMETHYLENEDIAMINE OF THE CLASS CONSISTING OF 3METHOXYHEXAMETHYLENEDIAMINE, 3-ETHOXYAMETHYLENEDIAMINE, AND 3-ISOBUTOXYHEXAMETHYLENEDIAMINE AND A DIALKYL OXALATE ESTER IN WHICH THE ALKYL GROUPS CONTAIN FROM 1 TO 4 CARBON ATOMS AT A TEMPERATURE WITHIN THE RANGE OF-7* C. TO &150* C. IN THE PRESENCE OF AN INERT ORGANIC DILUENT, SEPARATING THE RESULTING PREPOLYMER HAVING AN INHERENT VISCOSITY WITHIN THE RANGE OF 0.25 TO 0.50 FROM THE RESULTING MIXTURE AND THEREAFTER CONVERTING THE SAID PREPOLYMER TO A POLYMER HAVING AN INHERENT VISCOSITY WITHIN THE RANGE OF 0.9 TO 1.4 BY HEATING THE SAID PREPOLYMER IN AN OXYGEN-FREE ATMOSPHERE IN THE MOLTEN STATE AT A TEMPERATURE BELOW ITS THERMAL DECOMPOSITION TEMPERATURE.
References Cited (Backward Citations)
US2176074A
Cited
US2558031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-14 | 1958-09-13 | 1959-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-14 | 1962-09-13 | 1963-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-14 | 1966-09-13 | 1967-03-15 | $7700.00 | Window Closed / Lapsed |