US2884362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of organic isocyanates
Assignee: GAF Chemicals Corp
•
Filing: 1956-10-31
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Granted: 1959-04-28
•
Expires: 1976-10-31
Abstract
No abstract record available.
Inventors
- 👤 Bloom Albert
- 👤 Harlan B Freyermuth
- 👤 James B Normington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:36
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/18; C07C263/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS FOR RECOVERING AN ORGANIC ISOCYANATE FROM A CRUDE MIXTURE CONTAINING THE SAME, COMPRISING DISTILLING SAID ISOCYANATE FROM SAID MIXTURE IN THE PRESENCE OF ABOUT 25 TO 300%, BASED ON THE WEIGHT OF SAID ISOCYANATE, OF A LOWER POLYALKYLENE ETHER HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 300 WHICH IS LIQUID UNDER THE CONDITIONS OF THE DISTILLATION AND IN WHICH THE RECURRING ALKYLENE GROUPS CONTAIN FROM 2 TO 3 CARBON ATOMS.
Claim 2
Dependent Claim
73 words
A PROCESS FOR RECOVERING AN ORGANIC ISOCYANATE FROM A CRUDE MIXTURE CONTAINING THE SAME, COMPRISING DISTILLING SAID ISOCYANATE FROM SAID MIXTURE IN THE PRESENCE OF ABOUT 25 TO 300%, BASED ON THE WEIGHT OF SAID ISOCYANATE, OF A LOWER POLYALKYLENE ETHER HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 300 WHICH IS LIQUID UNDER THE CONDITIONS OF THE DISTILLATION AND IN WHICH THE RECURRING ALKYLENE GROUPS CONTAIN FROM 2 TO 3 CARBON ATOMS.
References Cited (Backward Citations)
US2757183A
Cited
US2680128A
Cited
US2680130A
Cited
US2680129A
Cited
US2819949A
Cited
GB761592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-27 | 1962-10-27 | 1963-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-27 | 1966-10-27 | 1967-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-27 | 1970-10-27 | 1971-04-28 | $7700.00 | Window Closed / Lapsed |