US2419599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of aromatic hydrocarbons
Assignee: Phillips Petroleum Co
•
Filing: 1942-10-05
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Granted: 1947-04-29
•
Expires: 1962-10-05
Abstract
No abstract record available.
Inventors
- 👤 Walter A Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:30
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/54; C07C2/64; C07C2/66; B; B01; B01J; B01J21/00; B01J21/12; C07C2521/00; C07C2521/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB456637A
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US2245734A
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US2107710A
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US2242960A
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US2258786A
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US2317803A
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US2290211A
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US2384505A
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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) | 1950-04-28 | 1950-10-28 | 1951-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-28 | 1954-10-28 | 1955-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-28 | 1958-10-28 | 1959-04-29 | $7700.00 | Window Closed / Lapsed |