US2653144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized polyheptamethyleneurea and process for making the same
Assignee: Akzo Nobel UK PLC
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Filing: 1950-08-03
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Granted: 1953-09-22
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Expires: 1970-08-03
Abstract
No abstract record available.
Inventors
- 👤 Edward A Wielicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:29
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
A COMPOSITION OF MATTER COMPRISING THE PRODUCT OBTAINED FROM THE REACTION BY HEATING OF SUBSTANTIALLY EQUIMOLECULAR PROPORTIONS OF HEPTAMETHYLENE DIAMINE AND A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF UREA AN HEPTAMETHYLENE DIISOCYANATE TO POLYUREA-FORMING TEMPERATURE WITH A MINOR PROPORTION OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ANILINE, UNSYMMETRICAL DIPHENYLUREA, ACETIC ACID, DIPHENYLAMINE AND HEXAMETHYLENE DIAMMONIUM ACETATE, SAID PRODUCT, IN RESPECT TO ITS MELT-VISCOSITY, BEING STABLE TO HEAT AT A TEMPERATURE BETWEEN 250* C. AND 280* C. FOR AT LEAST ONE HOUR.
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) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |