Patent CA676658A successfully refreshed from Google Patents.
Patent US3646237A successfully refreshed from Google Patents.
US3646237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering isobutylene
Assignee: Eneos Corp
•
Filing: 1969-08-28
•
Granted: 1972-02-29
•
Expires: 1989-08-28
Abstract
Abstract A PROCESS FOR RECOVERING HIGHLY PURIFIED ISOBUTYLENE COMPRISING CONTACTING AN ISOBUTYLENE-CONTAINING HYDROCARBON MIXTURE WITH AN AQUEOUS SOLUTION WHICH IS ACIDIFIED WITH HYDROCHLORIC ACID AND CONTAINING A CHLORIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF ZINC, TIN, ANTIMONY AND BISMUTH TO ALLOW THE ISOBUTYLENE TO BE ABSORBED IN THE FORM OF TERT-BUTYL ALCOHOL IN THE AQUEOUS SOLUTION; REMOVING UNREACTED HYDROCARBONS FROM SAID SOLUTION; SUBJECTING THE SOLUTION TO DEGASSING TREATMENT; AND SUBJECTING THEM TO DEHYDRATING TREATMENT; IN WHICH THE PRESENT INVENTION IS CHARACTERIZEDIN SAID DEGASSINGTREATMENT.
Inventors
- 👤 Tatsuo Horie
- 👤 Shigeyuki Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:51
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/14858; C07C7/14866; C07C7/17; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |