Patent US4473462A successfully refreshed from Google Patents.
US4473462A
Expired / Lapsed
US
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Treatment of petroleum and petroleum residues
Assignee: Chemroll Enterprises Inc
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Filing: 1983-04-20
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Granted: 1984-09-25
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Expires: 2003-04-20
Abstract
Abstract A process for converting into lighter viscosity products the heavy fractions of petroleum or other hydrocarbon containing components; catalysts especially suitable therefor and a process for this conversion have been disclosed; by further upgrading, the obtained products can be usefully employed as fuels and the like.
Inventors
- 👤 Rollan Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:15
CPC Classifications
C; C10; C10G; C10G47/00; C10G47/02; C10G47/06; C10G11/00; C10G11/02; C10G11/06; C10G47/32
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) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |