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Patent US1990213A successfully refreshed from Google Patents.
US1990213A
Expired / Lapsed
US
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Removal of substances forming resins from benzines
Assignee: IG Farbenindustrie AG
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Filing: 1933-07-28
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Granted: 1935-02-05
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Expires: 1953-07-28
Abstract
No abstract record available.
Inventors
- 👤 Winkler Fritz
- 👤 Haeuber Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:25
CPC Classifications
C; C08; C08F; C08F240/00; C10; C10G; C10G32/00; C10G32/02
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) | 1938-02-04 | 1938-08-06 | 1939-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-02-04 | 1942-08-06 | 1943-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-02-04 | 1946-08-06 | 1947-02-05 | $7700.00 | Window Closed / Lapsed |