Patent US5633909A successfully refreshed from Google Patents.
Patent US3090820A successfully refreshed from Google Patents.
US3090820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of aromatic hydrocarbons
Assignee: Monsanto Chemicals Ltd
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Filing: 1960-11-21
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Granted: 1963-05-21
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Expires: 1980-11-21
Abstract
No abstract record available.
Inventors
- 👤 Harry M Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:13
CPC Classifications
C; C10; C10G; C10G69/00; C10G69/02; C10G69/06; C10G2400/00; C10G2400/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE PROCES FOR THE RECOVERY OF VALUABLE AROMATIC HYDROCARBONS FROM STYRENE DISTILLATION RESIDUES WHICH COMPRISES SUBJECTING SAID RESIDUES TO PYROLYSIS IN THE PRESENCE OF STEAM AND HYDROGEN AT A TEMPERATURE IN THE RANGE FROM ABOUT 500* TO ABOUT 1500* F. AND A PRESSURE IN THE RANGE FROM ABOUT 300 TO ABOUT 1500* P.S.I., HYDROGENATING THE GASEOUS PYROLYSIS PRODUCT IN THE PRESENCE OF A HYDROGENATION CATALYST AT ELEVATED TEMPERATURES AND PRESSURES,
Claim 2
Dependent Claim
70 words
THE PROCES FOR THE RECOVERY OF VALUABLE AROMATIC HYDROCARBONS FROM STYRENE DISTILLATION RESIDUES WHICH COMPRISES SUBJECTING SAID RESIDUES TO PYROLYSIS IN THE PRESENCE OF STEAM AND HYDROGEN AT A TEMPERATURE IN THE RANGE FROM ABOUT 500* TO ABOUT 1500* F. AND A PRESSURE IN THE RANGE FROM ABOUT 300 TO ABOUT 1500* P.S.I., HYDROGENATING THE GASEOUS PYROLYSIS PRODUCT IN THE PRESENCE OF A HYDROGENATION CATALYST AT ELEVATED TEMPERATURES AND PRESSURES,
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) | 1966-05-20 | 1966-11-19 | 1967-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-20 | 1970-11-19 | 1971-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-20 | 1974-11-19 | 1975-05-21 | $7700.00 | Window Closed / Lapsed |