US2604440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydration of aqueous isopropanol
Assignee: Standard Oil Development Co
•
Filing: 1949-12-01
•
Granted: 1952-07-22
•
Expires: 1969-12-01
Abstract
No abstract record available.
Inventors
- 👤 John D Brooks
- 👤 Henry O Mottern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:26
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PROCESS FOR DEHYDRATING AN ISOPROPANOLWATER BINARY AZEOTROPE WHICH COMPPRISES DISTILLING THE AZEOTROPE IN A DIISTILLATION ZONE IN THE PRESENCE OF 30-65 WT. % SULFURIC ACID, AND REMOVING FROM THE DISTILLATION ZONE A DISTILLATE CONTAIN-
Claim 2
Dependent Claim
35 words
A PROCESS FOR DEHYDRATING AN ISOPROPANOLWATER BINARY AZEOTROPE WHICH COMPPRISES DISTILLING THE AZEOTROPE IN A DIISTILLATION ZONE IN THE PRESENCE OF 30-65 WT. % SULFURIC ACID, AND REMOVING FROM THE DISTILLATION ZONE A DISTILLATE CONTAIN-
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) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |