Patent US2203217A successfully refreshed from Google Patents.
US2203217A
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Process for recovering alkyl phenols from petroleum oils
Assignee: Shell Development Co
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Filing: 1937-05-25
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Granted: 1940-06-04
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Expires: 1957-05-25
Abstract
No abstract record available.
Inventors
- 👤 Walter J Hund
- 👤 Thomas Samuel Benson
- 👤 Jr Daniel B Luten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:10
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/005; C07C37/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-06-04 | 1943-12-04 | 1944-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-04 | 1947-12-04 | 1948-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-04 | 1951-12-04 | 1952-06-04 | $7700.00 | Window Closed / Lapsed |