US2843529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Upgrading of petroleum oils
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1954-08-17
•
Granted: 1958-07-15
•
Expires: 1974-08-17
Abstract
No abstract record available.
Inventors
- 👤 Ralph M Hill
- 👤 Jr Arthur W Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:41
CPC Classifications
C; C10; C10G; C10G69/00; C10G69/02; C10G69/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2069392A
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US2017836A
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US2312445A
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US2426929A
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US2467920A
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US2641573A
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US2655464A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |