US3216974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyester amides from oxazolidinones and acid anhydrides
Assignee: FABRIEK VAN CHEMISCHE PRODUCTEN VONDELINGENPLAAT NV
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Filing: 1961-12-26
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Granted: 1965-11-09
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Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Jacob Van Gijzen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:05
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
THE PROCESS FOR PREPARING A POLYESTER AMIDE WHICH COMPRISES REACTING ONE MOLE OF AN ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF ORGANIC DIBASIC ACID ANHYDRIDES, TRIMELLTIC ACID ANHYDRIDE AND PYROMELLTIC ACID DIANHYDRIDE WITH SUBSTANTIALLY ONE MOL OF A CYCLIC URETHANE SELECTED FROM THE GROUP CONSISTING OF OXAZOLIDINONE2,5-METHYLOXAZOLIDINONE-2, AND 4-PHENYLOXAZOLIDINONE-2 IN THE PRESENCE OF A POLYESTER AMIDE-FORMING CATALYST AT A TEMPERATURE OF 120* TO 190*C.
Claim 2
Dependent Claim
64 words
THE PROCESS FOR PREPARING A POLYESTER AMIDE WHICH COMPRISES REACTING ONE MOLE OF AN ANHYDRIDE SELECTED FROM THE GROUP CONSISTING OF ORGANIC DIBASIC ACID ANHYDRIDES, TRIMELLTIC ACID ANHYDRIDE AND PYROMELLTIC ACID DIANHYDRIDE WITH SUBSTANTIALLY ONE MOL OF A CYCLIC URETHANE SELECTED FROM THE GROUP CONSISTING OF OXAZOLIDINONE2,5-METHYLOXAZOLIDINONE-2, AND 4-PHENYLOXAZOLIDINONE-2 IN THE PRESENCE OF A POLYESTER AMIDE-FORMING CATALYST AT A TEMPERATURE OF 120* TO 190*C.
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) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |