US1903472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the extraction of ethylene glycol or its homologues
Assignee: Chemische Fabrik Kalk GmbH
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Filing: 1930-06-17
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Granted: 1933-04-11
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Expires: 1950-06-17
Abstract
No abstract record available.
Inventors
- 👤 Oehme Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:38
CPC Classifications
C; C07; C07C; C07C31/00; C07C31/18; C07C31/20
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) | 1936-04-10 | 1936-10-10 | 1937-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-04-10 | 1940-10-10 | 1941-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-04-10 | 1944-10-10 | 1945-04-11 | $7700.00 | Window Closed / Lapsed |