US2441095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of alkyl aromatic hydrocarbons into alkenyl aromatic hydrocarbons
Assignee: Shell Development Co
•
Filing: 1946-08-20
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Granted: 1948-05-04
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Expires: 1966-08-20
Abstract
No abstract record available.
Inventors
- 👤 Harry A Cheney
- 👤 Sumner H Mcallister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:14
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/40; C07C15/42; C07C15/44; C07C15/46; C07C4/00; C07C4/08; C07C4/12; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-04 | 1951-11-03 | 1952-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-04 | 1955-11-03 | 1956-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-04 | 1959-11-03 | 1960-05-04 | $7700.00 | Window Closed / Lapsed |