US2429622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic production of ethyl benzene
Assignee: Foster Wheeler Inc
•
Filing: 1942-10-28
•
Granted: 1947-10-28
•
Expires: 1962-10-28
Abstract
No abstract record available.
Inventors
- 👤 Joel H Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:29
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C15/073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB317500A
Cited
DE501198C
Cited
US2240160A
Cited
GB464752A
Cited
US2198595A
Cited
US2244512A
Cited
US2285606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-27 | 1951-04-28 | 1951-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-27 | 1955-04-28 | 1955-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-27 | 1959-04-28 | 1959-10-28 | $7700.00 | Window Closed / Lapsed |