US3156672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear polyureas prepared from half-polymers
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1960-05-10
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Granted: 1964-11-10
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Expires: 1980-05-10
Abstract
No abstract record available.
Inventors
- 👤 Gerrit Johann Meine Van D Kerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:09
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
A PROCESS FOR THE PREPARATION OF STABILIZED LINEAR POLYALKYLENE UREAS WHICH COMPRISES HEATING A HALF-POLYMER WITH A MOLECULAR WEIGHT BETWEEN ABOUT 1200 AND 5000 AND HAVING THE FORMULA
Claim 2
Dependent Claim
28 words
A PROCESS FOR THE PREPARATION OF STABILIZED LINEAR POLYALKYLENE UREAS WHICH COMPRISES HEATING A HALF-POLYMER WITH A MOLECULAR WEIGHT BETWEEN ABOUT 1200 AND 5000 AND HAVING THE FORMULA
References Cited (Backward Citations)
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US2830037A
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US2843568A
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US2877193A
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US2894933A
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US2973342A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |