Patent US3992676A successfully refreshed from Google Patents.
US2950263A
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Preparation of foamed castor oil citrate-organic polyisocyanate reaction products
Assignee: Imperial Chemical Industries Ltd
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Filing: 1958-05-02
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Granted: 1960-08-23
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Expires: 1978-05-02
Abstract
No abstract record available.
Inventors
- 👤 Abbotson William
- 👤 Hurd Reginald
- 👤 Shearing Herbert Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:19
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/28; C08G18/30; C08G18/36; C08G2110/00; C08G2110/0016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
PROCESS FOR THE MANUFACTURE OF FOAMED POLYURETHANES WHICH COMPRISES REACTING CASTOR OIL CITRATE WITH BETWEEN ABOUT 15 AND 200% OF ORGANIC POLYISOCYANATE BY WEIGHT OF SAID CASTOR OIL CITRATE IN THE PRESENCE OF A TERTIARY AMINE CATALYST AND WATER, THE CASTOR OIL CITRATE BEING PREPARED BY REACTING ONE MOLECULAR PROPORTION OF CASTOR OIL WITH 0.6 TO 1.2 MOLECULAR PROPORTION OF CITRIC ACID UNTIL THE ACID VALUE OF THE MIXTURE HAS FALLEN TO BETWEEN 45 TO 75 MG. KOH PER GM.
Claim 2
Dependent Claim
80 words
PROCESS FOR THE MANUFACTURE OF FOAMED POLYURETHANES WHICH COMPRISES REACTING CASTOR OIL CITRATE WITH BETWEEN ABOUT 15 AND 200% OF ORGANIC POLYISOCYANATE BY WEIGHT OF SAID CASTOR OIL CITRATE IN THE PRESENCE OF A TERTIARY AMINE CATALYST AND WATER, THE CASTOR OIL CITRATE BEING PREPARED BY REACTING ONE MOLECULAR PROPORTION OF CASTOR OIL WITH 0.6 TO 1.2 MOLECULAR PROPORTION OF CITRIC ACID UNTIL THE ACID VALUE OF THE MIXTURE HAS FALLEN TO BETWEEN 45 TO 75 MG. KOH PER GM.
References Cited (Backward Citations)
US2787601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |