Patent US3006898A successfully refreshed from Google Patents.
US3006898A
Expired / Lapsed
US
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Production of polymeric ureas
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-12-30
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Granted: 1961-10-31
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Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 Henry A Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:19
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR PRODUCING LINEAR POLYMERIC UREAS WHICH IS CARRIED OUT IN A SUBSTANTIALLY ANHYDROUS REACTION MEDIUM COMPRISING A CYANIC ACID-PRODUCING COMPOUND SELECTED FROM THE CLASS CONSISTING OF LOWER ALKYL NITROSO UREAS, AROMATIC NITROSO UREAS, CYCLOALKYL NITROSO UREAS AND NITRO UREA AND DIAMINE HAVING LESS THAN TERNARY SUBSTITUTION ON THE AMINE RADICALS THEREOF, IN AN INERT ORGANIC SOLVENT FOR SAID DIAMINE THE SAID SOLVENT HAVING A BOILING POINT OF BETWEEN 60-220*C. AND WHEREIN (A) CYANIC ACID IS PRODUCED IN SITU IN SAID MEDUIM FROM SAID CYANIC ACID-PRODUCING COMPOUND, AND (B) THE SAID CYANIC ACID INTERREACTS WOTH THE SAID DIAMINE TO PRODUCE AN INTERMEDIATE PRODUCT (C) WHICH INTERMEDIATE PRODUCT THEN POLYMERIZES TO PRODUCE THE SAID LINEAR POLYMERIC UREA, THE SAID PROCESS BEING CARRIED OUT WHILE MAINTAINING THE SAID REACTION MEDIUM UNDER REFLUX CONDITIONS.
Claim 2
Dependent Claim
132 words
A PROCESS FOR PRODUCING LINEAR POLYMERIC UREAS WHICH IS CARRIED OUT IN A SUBSTANTIALLY ANHYDROUS REACTION MEDIUM COMPRISING A CYANIC ACID-PRODUCING COMPOUND SELECTED FROM THE CLASS CONSISTING OF LOWER ALKYL NITROSO UREAS, AROMATIC NITROSO UREAS, CYCLOALKYL NITROSO UREAS AND NITRO UREA AND DIAMINE HAVING LESS THAN TERNARY SUBSTITUTION ON THE AMINE RADICALS THEREOF, IN AN INERT ORGANIC SOLVENT FOR SAID DIAMINE THE SAID SOLVENT HAVING A BOILING POINT OF BETWEEN 60-220*C. AND WHEREIN (A) CYANIC ACID IS PRODUCED IN SITU IN SAID MEDUIM FROM SAID CYANIC ACID-PRODUCING COMPOUND, AND (B) THE SAID CYANIC ACID INTERREACTS WOTH THE SAID DIAMINE TO PRODUCE AN INTERMEDIATE PRODUCT (C) WHICH INTERMEDIATE PRODUCT THEN POLYMERIZES TO PRODUCE THE SAID LINEAR POLYMERIC UREA, THE SAID PROCESS BEING CARRIED OUT WHILE MAINTAINING THE SAID REACTION MEDIUM UNDER REFLUX CONDITIONS.
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) | 1964-10-30 | 1965-05-01 | 1965-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-30 | 1969-05-01 | 1969-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-30 | 1973-05-01 | 1973-10-31 | $7700.00 | Window Closed / Lapsed |