Patent US1882816A successfully refreshed from Google Patents.
US1882816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of enhancing the viscosity of technical oils
Assignee: IG Farbenindustrie AG
•
Filing: 1929-10-30
•
Granted: 1932-10-18
•
Expires: 1949-10-30
Abstract
No abstract record available.
Inventors
- 👤 Hagedorn Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:46
CPC Classifications
C; C10; C10M; C10M145/00; C10M145/40; C10M2207/00; C10M2207/40; C10M2207/402; C10M2207/404; C10M2209/00; C10M2209/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1935-10-18 | 1936-04-18 | 1936-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-10-18 | 1940-04-18 | 1940-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-10-18 | 1944-04-18 | 1944-10-18 | $7700.00 | Window Closed / Lapsed |