US2448942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylation of phenolic compounds
Assignee: Shell Development Co
•
Filing: 1944-05-09
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Granted: 1948-09-07
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Expires: 1964-05-09
Abstract
No abstract record available.
Inventors
- 👤 De Loss E Winkler
- 👤 Robert H Mortimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:48
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/11; C07C37/16; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/182; C10L1/183; C10L1/1832; C10L1/22; C10L1/222; C10L1/223; C10L1/2235
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2140782A
Cited
US2291804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |