US2509885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isobutylene purification system
Assignee: Standard Oil Development Co
•
Filing: 1948-03-20
•
Granted: 1950-05-30
•
Expires: 1968-03-20
Abstract
No abstract record available.
Inventors
- 👤 Walter H Rupp
- 👤 John W Packie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:47
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/17; C07C7/171
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
IN THE PREPARATION OF ISOBUTYLENE COMPRISING ABSORPTION OF A MIXTURE OF C4 HYDROCARBONS CONTAINING ISOBUTYLENE, BUTENE-1, BUTENE-2, BUTADIENE, ISOBUTANE AND N-BUTANE IN AN ACID TO FORM AN ISOBUTYLENE-ACID EXTRACT AND SUBSEQUENT REGENERATION OF THE ISOBUTYLENE FROM THE ACID EXTRACT, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE ACID EXTRACT WITH A SATURATED ALIPHATIC HYDROCARBON OF 4 TO 8 CARBON ATOMS PER MOLECULE
Claim 2
Dependent Claim
60 words
IN THE PREPARATION OF ISOBUTYLENE COMPRISING ABSORPTION OF A MIXTURE OF C4 HYDROCARBONS CONTAINING ISOBUTYLENE, BUTENE-1, BUTENE-2, BUTADIENE, ISOBUTANE AND N-BUTANE IN AN ACID TO FORM AN ISOBUTYLENE-ACID EXTRACT AND SUBSEQUENT REGENERATION OF THE ISOBUTYLENE FROM THE ACID EXTRACT, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE ACID EXTRACT WITH A SATURATED ALIPHATIC HYDROCARBON OF 4 TO 8 CARBON ATOMS PER MOLECULE
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) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |