Patent US2091683A successfully refreshed from Google Patents.
US2091683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chrome tanning
Assignee: IG Farbenindustrie AG
•
Filing: 1936-01-03
•
Granted: 1937-08-31
•
Expires: 1956-01-03
Abstract
No abstract record available.
Inventors
- 👤 Immendoerfer Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:03
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/04; C14C3/06
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) | 1940-08-30 | 1941-03-01 | 1941-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-08-30 | 1945-03-01 | 1945-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-08-30 | 1949-03-01 | 1949-08-31 | $7700.00 | Window Closed / Lapsed |