US2422875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of refining hydrocarbons
Assignee: A Johnson & Co
•
Filing: 1944-06-24
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Granted: 1947-06-24
•
Expires: 1964-06-24
Abstract
No abstract record available.
Inventors
- 👤 Agren Per Henning Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:47
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/02; C10G45/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB236230A
Cited
US1884269A
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US2016271A
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GB438354A
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US2315144A
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US2325115A
Cited
US2340922A
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US2356095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-23 | 1950-12-23 | 1951-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-23 | 1954-12-23 | 1955-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-23 | 1958-12-23 | 1959-06-24 | $7700.00 | Window Closed / Lapsed |