US2629686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of butanediol
Assignee: GAF Chemicals Corp
•
Filing: 1950-08-25
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Granted: 1953-02-24
•
Expires: 1970-08-25
Abstract
No abstract record available.
Inventors
- 👤 Grosser Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:02
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS FOR PURIFYING TECHNICAL BUTANEDIOL-1,4 WHICH COMPRISES TREATING TECHNICAL BUTANEDIOL WITH A SOLID ADSORBENT SELECTED FROM THE GROUP CONSISTING OF ACTIVATED CHARCOAL, ACID TREATED SILICA GEL AND FULLER''S EARTH SEPARATING THE THUS TREATED BUTANEDIOL FROM THE ADSORBENT AND VACUUM DISTILLING THE THUS TREATED BUTANEDIOL.
Claim 2
Dependent Claim
45 words
A PROCESS FOR PURIFYING TECHNICAL BUTANEDIOL-1,4 WHICH COMPRISES TREATING TECHNICAL BUTANEDIOL WITH A SOLID ADSORBENT SELECTED FROM THE GROUP CONSISTING OF ACTIVATED CHARCOAL, ACID TREATED SILICA GEL AND FULLER''S EARTH SEPARATING THE THUS TREATED BUTANEDIOL FROM THE ADSORBENT AND VACUUM DISTILLING THE THUS TREATED BUTANEDIOL.
References Cited (Backward Citations)
US2319707A
Cited
US2472912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-24 | 1956-08-25 | 1957-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-24 | 1960-08-25 | 1961-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-24 | 1964-08-25 | 1965-02-24 | $7700.00 | Window Closed / Lapsed |