US2647108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polythioureas
Assignee: Akzo Nobel UK PLC
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Filing: 1951-10-29
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Granted: 1953-07-28
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Expires: 1971-10-29
Abstract
No abstract record available.
Inventors
- 👤 David J Waters
- 👤 Donald L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:06
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR THE PRODUCTION OF POLYTHIOUREAS BY REACTING CARBON DISULPHIDE WITH A PRIMARY DIAMINE, THE AMINO GROUPS OF WHICH ARE SEPARATED BY A CHAIN CONTAINING AT LEAST THREE CARBON ATOMS, TO FORM AN INTERMEDIATE SALT AND HEATING THIS SALT, COMPRISING HEATING THE SALT IN THE PRESENCE OF AN AQUEOUS MEDIUM UNTIL FROM 70 PER CENT TO 95 PER CENT OF THE THEORETICAL YIELD OF A THERMOPLASTIC POLYTHIOUREA HAS BEEN PRECIPITATED, REMOVING MOST OF THE AQUEOUS LIQUOR ASSOCIATED WITH THE POLYMER AND THEN HEATING THE POLYMER, STILL IN THE PRESENCE OF AN AQUEOUS MEDIUM UNTIL A FIBREFORMING THERMOPLASTIC POLYTHIOUREA IS OBTAINED
Claim 2
Dependent Claim
101 words
A PROCESS FOR THE PRODUCTION OF POLYTHIOUREAS BY REACTING CARBON DISULPHIDE WITH A PRIMARY DIAMINE, THE AMINO GROUPS OF WHICH ARE SEPARATED BY A CHAIN CONTAINING AT LEAST THREE CARBON ATOMS, TO FORM AN INTERMEDIATE SALT AND HEATING THIS SALT, COMPRISING HEATING THE SALT IN THE PRESENCE OF AN AQUEOUS MEDIUM UNTIL FROM 70 PER CENT TO 95 PER CENT OF THE THEORETICAL YIELD OF A THERMOPLASTIC POLYTHIOUREA HAS BEEN PRECIPITATED, REMOVING MOST OF THE AQUEOUS LIQUOR ASSOCIATED WITH THE POLYMER AND THEN HEATING THE POLYMER, STILL IN THE PRESENCE OF AN AQUEOUS MEDIUM UNTIL A FIBREFORMING THERMOPLASTIC POLYTHIOUREA IS OBTAINED
References Cited (Backward Citations)
GB524795A
Cited
US2566717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |