US2820024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of linear poly-ureas
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1954-03-31
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Granted: 1958-01-14
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Expires: 1974-03-31
Abstract
No abstract record available.
Inventors
- 👤 Gerrit Johann Meine Van D Kerk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:32
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS FOR THE PREPARATION OF A SYNTEHTIC RESIN MASS COMPRISING REACTING A DIAMINE VOLATILIZABLE UNDER THE VACUUM AND TEMPERATURE CONDITIONS HEREINAFTER SPECIFIED, HAVING THE GENERAL FORMULA H2N-R-NH2, WHEREIN R IS AN ALIPHATIC, NON-FUNCTIONAL, DIVALENT GROUP HAVING AT LEAST FOUR CARBON ATOMS IN THE CHAIN WITH CARBONOXYSULFIDE AND SUBSEQUENTLY TRANSFORMING THE MONOTHIOCARBAMATE COMPOUND FORMED CONTAINING EQUIMOLECULAR AMOUNTS OF THIOCARBAMIC ACID AND AMINE GROUPS AND POSSESSING THE SCHEMATIC MOLECULAR FORMULA
Claim 2
Dependent Claim
69 words
A PROCESS FOR THE PREPARATION OF A SYNTEHTIC RESIN MASS COMPRISING REACTING A DIAMINE VOLATILIZABLE UNDER THE VACUUM AND TEMPERATURE CONDITIONS HEREINAFTER SPECIFIED, HAVING THE GENERAL FORMULA H2N-R-NH2, WHEREIN R IS AN ALIPHATIC, NON-FUNCTIONAL, DIVALENT GROUP HAVING AT LEAST FOUR CARBON ATOMS IN THE CHAIN WITH CARBONOXYSULFIDE AND SUBSEQUENTLY TRANSFORMING THE MONOTHIOCARBAMATE COMPOUND FORMED CONTAINING EQUIMOLECULAR AMOUNTS OF THIOCARBAMIC ACID AND AMINE GROUPS AND POSSESSING THE SCHEMATIC MOLECULAR FORMULA
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) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |