US2438874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of asphalt from hydrocarbons
Assignee: ExxonMobil Oil Corp
•
Filing: 1944-12-16
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Granted: 1948-03-30
•
Expires: 1964-12-16
Abstract
No abstract record available.
Inventors
- 👤 Jacob R Meadow
- 👤 Reid Ebenezer Emmet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:36
CPC Classifications
C; C10; C10G; C10G17/00; C10G17/02; C10G17/04; C10G17/07; C10C; C10C3/00; C10C3/02; C10C3/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB292932A
Cited
US2310812A
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US2247375A
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US2320629A
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US2366743A
Cited
US2343841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-30 | 1951-09-29 | 1952-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-30 | 1955-09-29 | 1956-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-30 | 1959-09-29 | 1960-03-30 | $7700.00 | Window Closed / Lapsed |