Patent US2453961A successfully refreshed from Google Patents.
US2453961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dewatering apparatus
Assignee: Hewitt Robins Inc
•
Filing: 1945-04-26
•
Granted: 1948-11-16
•
Expires: 1965-04-26
Abstract
No abstract record available.
Inventors
- 👤 William F Bankauf
- 👤 Harry B Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:39
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
NL31744C
Cited
US203104A
Cited
US633040A
Cited
US871366A
Cited
US918054A
Cited
US975331A
Cited
US1350154A
Cited
US2061841A
Cited
US2136400A
Cited
US2322415A
Cited
US2323920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-16 | 1952-05-17 | 1952-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-16 | 1956-05-17 | 1956-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-16 | 1960-05-17 | 1960-11-16 | $7700.00 | Window Closed / Lapsed |