US2423176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of aromatic hydrocarbons
Assignee: Shell Development Co
•
Filing: 1945-01-26
•
Granted: 1947-07-01
•
Expires: 1965-01-26
Abstract
No abstract record available.
Inventors
- 👤 Robert M Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:39
CPC Classifications
C; C07; C07C; C07C15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB296429A
Cited
GB418926A
Cited
US2241393A
Cited
US2374175A
Cited
US2288866A
Cited
US2298346A
Cited
US2283854A
Cited
US2348557A
Cited
US2355366A
Cited
US2376086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-30 | 1950-12-30 | 1951-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-30 | 1954-12-30 | 1955-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-30 | 1958-12-30 | 1959-07-01 | $7700.00 | Window Closed / Lapsed |