US2550767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polymeric ureas
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1947-11-18
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Granted: 1951-05-01
•
Expires: 1967-11-18
Abstract
No abstract record available.
Inventors
- 👤 Buckley Gerard Dunstan
- 👤 Ray Neil Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:22
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
PROCESS FOR THE MANUFACTURE OF POLYCONDESNATION PRODUCTS WHICH COMPRISES REACTING A POLYAMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND CYCLOALIPHATIC POLYAMINES AND CARBONATES THEREOF WITH CARBON DIOXIDE AT A TEMPERATURE ABOVE 100* C. AND A PRESSURE EXCEEDING 100 ATMOSPHERES.
Claim 2
Dependent Claim
41 words
PROCESS FOR THE MANUFACTURE OF POLYCONDESNATION PRODUCTS WHICH COMPRISES REACTING A POLYAMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND CYCLOALIPHATIC POLYAMINES AND CARBONATES THEREOF WITH CARBON DIOXIDE AT A TEMPERATURE ABOVE 100* C. AND A PRESSURE EXCEEDING 100 ATMOSPHERES.
References Cited (Backward Citations)
US2130948A
Cited
US2145242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |