US2706169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash distillation of 2,4-tolylene diisocyanate
Assignee: EIDP Inc
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Filing: 1954-03-04
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Granted: 1955-04-12
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Expires: 1974-03-04
Abstract
No abstract record available.
Inventors
- 👤 Theodore R Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:54
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/18; C07C263/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE PROCESS OF RECOVERING 2,4-TOLYLENE DIISOCYANATE FROM THE RESIDUAL TARRY MASS RESULTING FROM ITS DISTILLATION, WHICH COMPRISES HEATING A 2,4-TOLYLENE DIISOCYANATETAR MIXTURE CONTAINING FROM 40% TO 60% OF 2,4-TOLYLENE DIISOCYANATE UNDER PRESSURE TO A TEMPERATURE OF FROM 200* TO 300* C., INTRODUCING THE SUPERHEATED MIXTURE INTO A ZONE MAINTAINED AT A PRESSURE SUBSTANTIALLY LOWER THAN THE BOILING POINT OF THE 2,4-TOLYLENE DIISOCYANATE, AND RECOVERING THE PURIFIED 2,4-TOLYLENE DIISOCYANATE FROM THE VAPOR PHASE.
Claim 2
Dependent Claim
72 words
THE PROCESS OF RECOVERING 2,4-TOLYLENE DIISOCYANATE FROM THE RESIDUAL TARRY MASS RESULTING FROM ITS DISTILLATION, WHICH COMPRISES HEATING A 2,4-TOLYLENE DIISOCYANATETAR MIXTURE CONTAINING FROM 40% TO 60% OF 2,4-TOLYLENE DIISOCYANATE UNDER PRESSURE TO A TEMPERATURE OF FROM 200* TO 300* C., INTRODUCING THE SUPERHEATED MIXTURE INTO A ZONE MAINTAINED AT A PRESSURE SUBSTANTIALLY LOWER THAN THE BOILING POINT OF THE 2,4-TOLYLENE DIISOCYANATE, AND RECOVERING THE PURIFIED 2,4-TOLYLENE DIISOCYANATE FROM THE VAPOR PHASE.
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) | 1958-04-11 | 1958-10-11 | 1959-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-11 | 1962-10-11 | 1963-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-11 | 1966-10-11 | 1967-04-12 | $7700.00 | Window Closed / Lapsed |