US2190918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving lubricating oils
Assignee: Ruhrchemie AG
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Filing: 1935-07-05
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Granted: 1940-02-20
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Expires: 1955-07-05
Abstract
No abstract record available.
Inventors
- 👤 Goethel Herbert
- 👤 Tramm Heinrich
- 👤 Schaller Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:45
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10G; C10G50/00; C10G50/02; C10M2205/00; C10M2205/02; C10M2205/022; C10M2205/024; C10M2205/14; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
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) | 1943-02-19 | 1943-08-21 | 1944-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-19 | 1947-08-21 | 1948-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-19 | 1951-08-21 | 1952-02-20 | $7700.00 | Window Closed / Lapsed |