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Patent US2334400A successfully refreshed from Google Patents.
US2334400A
Expired / Lapsed
US
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Purification of polyhydric alcohols
Assignee: Shell Development Co
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Filing: 1939-06-10
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Granted: 1943-11-16
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Expires: 1959-06-10
Abstract
No abstract record available.
Inventors
- 👤 Theodore W Evans
- 👤 James R Scheibli
- 👤 Griendt Gerald H Van De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:13
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/16; F; F16; F16L; F16L59/00; F16L59/02; F16L59/027
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) | 1946-11-15 | 1947-05-17 | 1947-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-11-15 | 1951-05-17 | 1951-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-11-15 | 1955-05-17 | 1955-11-16 | $7700.00 | Window Closed / Lapsed |