US2580468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing an isocyanate
Assignee: Wyeth Holdings LLC
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Filing: 1949-08-13
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Granted: 1952-01-01
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Expires: 1969-08-13
Abstract
No abstract record available.
Inventors
- 👤 Frederic C Schaefer
- 👤 Erhart K Drechsel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:02
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE METHOD OF PREPARING AN ALIPHATIC HYDROCARBON ISOCYANATE REPRESENTED BY THE FORMULA RNCO, WHERE R REPRESENTS AN ALIKPHATIC HYDROCARBON GROUPING WHEREIN ANY UNSATURATION IS ETHYLENIC UNSATURATION, SAID METHOD COMPRISING PYROLYZING THE CORRESPONDING TRI-(ALIPHATIC HYDROCARBON) ISOCYANURATE UNDER ANHYDROUS CONDITIONS IN THE PRESENCE OF HYDROGEN CHLORIDE AT A TEMPERATURE OF AT LEAST 120* C. BUT BELOW THE TEMPERATURE OF DECOMPOSITION OF THE ISOCYANATE WHICH IS FORMED, AND ISOLATING THE SAID ISOCYANATE.
Claim 2
Independent Claim
69 words
THE METHOD OF PREPARING AN ALIPHATIC HYDROCARBON ISOCYANATE REPRESENTED BY THE FORMULA RNCO, WHERE R REPRESENTS AN ALIKPHATIC HYDROCARBON GROUPING WHEREIN ANY UNSATURATION IS ETHYLENIC UNSATURATION, SAID METHOD COMPRISING PYROLYZING THE CORRESPONDING TRI-(ALIPHATIC HYDROCARBON) ISOCYANURATE UNDER ANHYDROUS CONDITIONS IN THE PRESENCE OF HYDROGEN CHLORIDE AT A TEMPERATURE OF AT LEAST 120* C. BUT BELOW THE TEMPERATURE OF DECOMPOSITION OF THE ISOCYANATE WHICH IS FORMED, AND ISOLATING THE SAID ISOCYANATE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |