Patent US3789079A successfully refreshed from Google Patents.
US3789079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of diene from organic mixtures
Assignee: Monsanto Co
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Filing: 1972-09-22
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Granted: 1974-01-29
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Expires: 1992-09-22
Abstract
Abstract AND WITHDRAWING AT THE OTHER SIDE A VAPOROUS MIXTURE HAVING INCREASED DIENE CONCENTRATION. Exemplary of the organic mixtures is a mixture of butadiene and butene. Dienes are separated from organic mixtures comprising diene and alkene having one double bond by contacting the mixture against one side of a polymeric permeation membrane which is an aromatic imide polymer of the formula
Inventors
- 👤 E Perry
- 👤 W Strazik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:00
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/36; B01D61/362; B01D71/00; B01D71/06; B01D71/58; B01D71/62; B01D71/64; C; C07; C07C; C07C7/00; C07C7/144
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
The process of claim 1 wherein the pressure on the second side of the membrane is less than atmospheric pressure and lower than the pressure on the other side of the membrane.
Claim 2
Dependent Claim
14 words
The process of claim 1 wherein the said organic mixture is a liquid mixture.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the said organic mixture comprises butadiene and butene.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |