US3830732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent deasphalting process
Assignee: Universal Oil Products Co
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Filing: 1972-09-18
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Granted: 1974-08-20
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Expires: 1992-09-18
Abstract
Abstract AN ASPHALTENE-CONTAINING CHARGE STOCK IS SUBJECTED TO SOLVENT DEASPHALTING TO PROVIDE A RESIN- AND ASPHALTENECONTAINING, SOLVENT-LEAN HYDROCARBON PHASE. THIS SOLVENTLEAN PHASE IS SUBJECT TO A SECOND SOLVENT DEAPHALTING TECHNIQUE IN ORDER TO COVER A RESIN CONCENTRATE AND TO REJECT AN ASPHALTIC PITCH.
Inventors
- 👤 J Gatsis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:21
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/003; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0403; B01D11/0407
Claims Analysis
Total Claims: 0
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |