US2800464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Addition of acid to halt polyurethane producing reaction
Assignee: Celanese Corp
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Filing: 1952-04-11
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Granted: 1957-07-23
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Expires: 1972-04-11
Abstract
No abstract record available.
Inventors
- 👤 Alfred L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:36
CPC Classifications
C; C08; C08L; C08L75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
PROCESS FOR THE PRODUCTION OF POLYURETHANES, WHICH COMPRISES FORMING A HETEROGENEOUS MIXTURE CONTAINING IN ONE PHASE A POLYAMINE FREE FROM REACTIVE GROUPS OTHER THAN AMINO GROUPS AND HAVING T LEAST ONE HYDROGEN ATOM ATTACHED TO EACH NITROGEN ATOM, AND IN ANOTHER PHASE A BIS-CHLOROFORMATE FREE FROM REACTIVE GROUPS OTHER THAN THE CHLORORFORMATE GROUPS, EFFECTING A POLYMERIZATION REACTION WITHIN SAID MIXTURE BETWEEN THE POLYAMINE AND THE BIS-CHLORAFORMATE TO PRODUCE THE POLYURETHANE, ANE CAUSING THE HALTING OF SAID POLYMERIZATION REACTION WHILE IT IS STILL PROCEEDING AND BEFORE THE SAME REACHES THE POINT OF ABOUT 95% OF THE TOTAL THERORETICAL YIELD OF POLYMER BEING FORMED, SAID POLYMERIZATION REACTION BEING HALTED BY ADDING AN ACID TO THE MIXTURE.
Claim 2
Dependent Claim
114 words
PROCESS FOR THE PRODUCTION OF POLYURETHANES, WHICH COMPRISES FORMING A HETEROGENEOUS MIXTURE CONTAINING IN ONE PHASE A POLYAMINE FREE FROM REACTIVE GROUPS OTHER THAN AMINO GROUPS AND HAVING T LEAST ONE HYDROGEN ATOM ATTACHED TO EACH NITROGEN ATOM, AND IN ANOTHER PHASE A BIS-CHLOROFORMATE FREE FROM REACTIVE GROUPS OTHER THAN THE CHLORORFORMATE GROUPS, EFFECTING A POLYMERIZATION REACTION WITHIN SAID MIXTURE BETWEEN THE POLYAMINE AND THE BIS-CHLORAFORMATE TO PRODUCE THE POLYURETHANE, ANE CAUSING THE HALTING OF SAID POLYMERIZATION REACTION WHILE IT IS STILL PROCEEDING AND BEFORE THE SAME REACHES THE POINT OF ABOUT 95% OF THE TOTAL THERORETICAL YIELD OF POLYMER BEING FORMED, SAID POLYMERIZATION REACTION BEING HALTED BY ADDING AN ACID TO THE MIXTURE.
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) | 1960-07-22 | 1961-01-21 | 1961-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-22 | 1965-01-21 | 1965-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-22 | 1969-01-21 | 1969-07-23 | $7700.00 | Window Closed / Lapsed |