US2555798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of acrylonitrile by steam distillation
Assignee: Wyeth Holdings LLC
•
Filing: 1945-06-21
•
Granted: 1951-06-05
•
Expires: 1965-06-21
Abstract
No abstract record available.
Inventors
- 👤 Edward L Kropa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:19
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/32; C07C253/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
A PROCESS FOR THE PURIFICATION OF ACRYLONITRILE COMPRISING STEAM DISTILLING A MIXTURE OF ACRYLONITRILE AND A NON-VOLATILE POLYBASIC INORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID AND SULFURIC ACID.
Claim 2
Dependent Claim
31 words
A PROCESS FOR THE PURIFICATION OF ACRYLONITRILE COMPRISING STEAM DISTILLING A MIXTURE OF ACRYLONITRILE AND A NON-VOLATILE POLYBASIC INORGANIC ACID SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID AND SULFURIC ACID.
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) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |