US2551820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction column
Assignee: Allis Chalmers Corp
•
Filing: 1947-08-29
•
Granted: 1951-05-08
•
Expires: 1967-08-29
Abstract
No abstract record available.
Inventors
- 👤 Guy V Woody
- 👤 Charles W Bilbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:20
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/02; B01D11/0215; B01D11/0223; B01D11/0238; B01D11/028; B01D11/0284
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1055475A
Cited
US1146783A
Cited
US1545814A
Cited
US1689159A
Cited
US1793465A
Cited
US2042818A
Cited
US2158782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |