US3223682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of linear polyurea polymers from urea and an alicyclic diamine
Assignee: WR Grace and Co
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Filing: 1961-11-28
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Granted: 1965-12-14
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Expires: 1981-11-28
Abstract
No abstract record available.
Inventors
- 👤 Gabler Rudolf
- 👤 Muller Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:07
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR PREPARING A HIGH MOLECULE WEIGHT, FIBER FORMING, ESSENTAILLY LINEAR, THERMOPLASTIC POLYUREA POLYMER WHICH COMPRISES HEATING EQUIMOLAR AMOUNTS OF UREA NAD AN ALICYCLIC DIAMINE AT A TEMPERATURE RANGING BETWEEN ABOUT 150*C. AND 300*C. FOR A PERIOD OF ABOUT 2.5 TO 8 HOURS IN AN OXYGEN-FREE ATMOSPHERE, CONTINUING THE REACTION UNTIL THE LIBERATION OF AMMONIA HAS CEASED, AND RECOVERING THE RESULTING POLYMER, SAID DIAMINE HAVING THE STRUCTURE CONSISTING OF
Claim 2
Dependent Claim
70 words
A PROCESS FOR PREPARING A HIGH MOLECULE WEIGHT, FIBER FORMING, ESSENTAILLY LINEAR, THERMOPLASTIC POLYUREA POLYMER WHICH COMPRISES HEATING EQUIMOLAR AMOUNTS OF UREA NAD AN ALICYCLIC DIAMINE AT A TEMPERATURE RANGING BETWEEN ABOUT 150*C. AND 300*C. FOR A PERIOD OF ABOUT 2.5 TO 8 HOURS IN AN OXYGEN-FREE ATMOSPHERE, CONTINUING THE REACTION UNTIL THE LIBERATION OF AMMONIA HAS CEASED, AND RECOVERING THE RESULTING POLYMER, SAID DIAMINE HAVING THE STRUCTURE CONSISTING OF
References Cited (Backward Citations)
US2181663A
Cited
GB535139A
Cited
DE925496C
Cited
US2595400A
Cited
US2709694A
Cited
US2828291A
Cited
US2888438A
Cited
US2975157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |