US2167243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual drum mixer
Assignee: Koehring Co
•
Filing: 1937-11-16
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Granted: 1939-07-25
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Expires: 1957-11-16
Abstract
No abstract record available.
Inventors
- 👤 Erich H Lichtenberg
- 👤 Sheck Oscar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:03
CPC Classifications
B; B28; B28C; B28C5/00; B28C5/08; B28C5/18; B28C5/20; B28C5/2009
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) | 1942-07-24 | 1943-01-23 | 1943-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-07-24 | 1947-01-23 | 1947-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-07-24 | 1951-01-23 | 1951-07-25 | $7700.00 | Window Closed / Lapsed |