Patent US3265591A successfully refreshed from Google Patents.
US3265591A
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Separation of butadiene from butenes by distilling in the presence of an aqueous solution of silver salts
Assignee: EIDP Inc
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Filing: 1962-11-15
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Granted: 1966-08-09
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Expires: 1982-11-15
Abstract
No abstract record available.
Inventors
- 👤 Halliwell Ronald Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:31
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
METHOD FOR THE SEPARATION OF BUTADIENE FROM IXTURES THEREOF WITH BUTENES WHICH COMPRISES INTRODUCING SAID MIXTURE INTO A DISTILLATION COLUMN MAINTAINED AT A TEMPERATURE ABOVE THE BOILING POINT OF SAID MIXTURE AND BELOW 120* C., PASSING AN AQUEOUS SOLUTION OF A SILVER SALT SELECTED FROM THE GROUP CONSISTING OF SILVER FLUOBORATE, SILVER FLUOSILICATE AND MIXTURES THEREOF, SAID SILVER SALT BEING EMPLOYED IN A CONCENTRATION OF ABOUT ONE TO SIX MOLAR, THROUGH THE COLUMN, RECOVERING BUTENES FROM THE
Claim 2
Dependent Claim
77 words
METHOD FOR THE SEPARATION OF BUTADIENE FROM IXTURES THEREOF WITH BUTENES WHICH COMPRISES INTRODUCING SAID MIXTURE INTO A DISTILLATION COLUMN MAINTAINED AT A TEMPERATURE ABOVE THE BOILING POINT OF SAID MIXTURE AND BELOW 120* C., PASSING AN AQUEOUS SOLUTION OF A SILVER SALT SELECTED FROM THE GROUP CONSISTING OF SILVER FLUOBORATE, SILVER FLUOSILICATE AND MIXTURES THEREOF, SAID SILVER SALT BEING EMPLOYED IN A CONCENTRATION OF ABOUT ONE TO SIX MOLAR, THROUGH THE COLUMN, RECOVERING BUTENES FROM THE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |