Patent US2270674A successfully refreshed from Google Patents.
US2270674A
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US
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Method of separating high molecular mixtures
Assignee: Shell Development Co
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Filing: 1936-04-25
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Granted: 1942-01-20
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Expires: 1956-04-25
Abstract
No abstract record available.
Inventors
- 👤 Pilat Stanislaw
- 👤 Godlewicz Marian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:13
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/14; C11; C11B; C11B7/00; C11B7/0008; C11B7/005
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) | 1945-01-19 | 1945-07-21 | 1946-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-19 | 1949-07-21 | 1950-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-19 | 1953-07-21 | 1954-01-20 | $7700.00 | Window Closed / Lapsed |