Patent US3707065A successfully refreshed from Google Patents.
US3707065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of pyrolytic gas mixtures
Assignee: ERDOLCHEMILE GMBH
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Filing: 1971-08-17
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Granted: 1972-12-26
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Expires: 1991-08-17
Abstract
Abstract Steam, diene hydrocarbons, styrene and methylstyrenes are removed from crude gas by scrubbing the gas with a regeneratable glycol extractant and thereafter removing polymerizable hydrocarbons and/or polymers dissolved in the glycol by a liquidliquid extraction.
Inventors
- 👤 Hans Joachim Muller
- 👤 Horst Bruckner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:00
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0492
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
16 words
Process of claim 1 wherein the glycol is an alkylene glycol containing from 2-9 carbon atoms.
Claim 2
Dependent Claim
28 words
Process of claim 1 wherein said glycol is selected from the group of mono-, di-, tri- and tetra-ethylene glycol, mono-, di-and tri-propylene glycol and mixtures of the foregoing.
Claim 3
Dependent Claim
25 words
Process of claim 1 wherein said hydrocarbon solvent is selected from the group of paraffinic hydrocarbons, naphthenic hydrocarbons, aromatic hydrocarbons and mixtures of the foregoing.
References Cited (Backward Citations)
US3349544A
Cited
US3655806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |