US2978449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric isocyanates and their manufacture
Assignee: Imperial Chemical Industries Ltd
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Filing: 1957-11-12
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Granted: 1961-04-04
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Expires: 1977-11-12
Abstract
No abstract record available.
Inventors
- 👤 France Harold
- 👤 Lister Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:03
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/02; C08G18/022; C07; C07D; C07D229/00; Y; Y10; Y10S; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS FOR THE PREPARATION OF ISOCYANATE GROUPCONTAINING ISOCYANURATE COMPOUNDS BY POLYMERIZING ORGANIC POLYISOCYANATES COMPRISING POLYMERIZING AN ORGANIC POLYISOCYANATE AT A TEMPERATURE FROM AROUND ROOM TEMPERATURE TO BELOW 200*C. IN THE PRESENCE OF LEAD 2-ETHYLHEXOATE AND INTERRUPTING THE REACTING AFTER THE FORMATION OF ISOCYANURATE RINGS DETECTABLE BY INFRA-RED ABSORPTION AT 5.85 TO 7.05 MICRONS.
Claim 2
Dependent Claim
54 words
A PROCESS FOR THE PREPARATION OF ISOCYANATE GROUPCONTAINING ISOCYANURATE COMPOUNDS BY POLYMERIZING ORGANIC POLYISOCYANATES COMPRISING POLYMERIZING AN ORGANIC POLYISOCYANATE AT A TEMPERATURE FROM AROUND ROOM TEMPERATURE TO BELOW 200*C. IN THE PRESENCE OF LEAD 2-ETHYLHEXOATE AND INTERRUPTING THE REACTING AFTER THE FORMATION OF ISOCYANURATE RINGS DETECTABLE BY INFRA-RED ABSORPTION AT 5.85 TO 7.05 MICRONS.
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) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |