Patent US3022334A successfully refreshed from Google Patents.
US3022334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyurethanes
Assignee: EIDP Inc
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Filing: 1958-01-14
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Granted: 1962-02-20
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Expires: 1978-01-14
Abstract
No abstract record available.
Inventors
- 👤 August H Frazer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:32
CPC Classifications
C; C08; C08L; C08L75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN A PROCESS FOR PREPARING POLYURETHANES BY REACTING AN ORGANIC DIAMINE WITH A BISHALOFORMATE WHEREIN HYDROGEN HALIDE IS LIBERATED, THE IMPROVEMENT WHICH COMPRISES PROVIDING N-ALKYLATED POLYURETHANES OF UNIFORM DIFUNCTIONALITY BY REACTING AN N,N''-DIALKYL-SUBSTITUTED DIAMINE IN WHICH THE NITROGENS BEAR ONLY ONE HYDROGEN ATOM WITH A BISHALOFORMATAE OF AN ORGANIC DIOL IN THE PRESENCE OF AN INORGANIC METALLIFEROUS HYDROGEN HALIDE ACCEPTOR, SAID REACTION BEING CARRIED OUT BY MIXING UNDER ANHYDROUS CONDITIONS SAID HALIDE ACCEPTOR WITH SAID DIAMINE AND SAID BISHALOFORMATE IN AN INERT ORGANIC SOLVENT FOR SAID DIAMINE AND SAID BISHALOFORMATAE, SAID HALIDE ACCEPTOR BAEING PRESENT IN AN AMOUNT IN EXCESS OF THE STOICHIOMETRIC AMOUNT NECESSARY TO BIND THE HYDROGEN HALIDE LIBERATED BY SAID REACTION.
Claim 2
Dependent Claim
114 words
IN A PROCESS FOR PREPARING POLYURETHANES BY REACTING AN ORGANIC DIAMINE WITH A BISHALOFORMATE WHEREIN HYDROGEN HALIDE IS LIBERATED, THE IMPROVEMENT WHICH COMPRISES PROVIDING N-ALKYLATED POLYURETHANES OF UNIFORM DIFUNCTIONALITY BY REACTING AN N,N''-DIALKYL-SUBSTITUTED DIAMINE IN WHICH THE NITROGENS BEAR ONLY ONE HYDROGEN ATOM WITH A BISHALOFORMATAE OF AN ORGANIC DIOL IN THE PRESENCE OF AN INORGANIC METALLIFEROUS HYDROGEN HALIDE ACCEPTOR, SAID REACTION BEING CARRIED OUT BY MIXING UNDER ANHYDROUS CONDITIONS SAID HALIDE ACCEPTOR WITH SAID DIAMINE AND SAID BISHALOFORMATE IN AN INERT ORGANIC SOLVENT FOR SAID DIAMINE AND SAID BISHALOFORMATAE, SAID HALIDE ACCEPTOR BAEING PRESENT IN AN AMOUNT IN EXCESS OF THE STOICHIOMETRIC AMOUNT NECESSARY TO BIND THE HYDROGEN HALIDE LIBERATED BY SAID REACTION.
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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |