Patent US2768707A successfully refreshed from Google Patents.
US2768707A
Expired / Lapsed
US
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Separator for use with vacuum cleaning
Assignee: Centrifix Corp
•
Filing: 1954-01-04
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Granted: 1956-10-30
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Expires: 1974-01-04
Abstract
No abstract record available.
Inventors
- 👤 Campbell Charles Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:47
CPC Classifications
B; B04; B04C; B04C5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189519642A
Cited
GB190418409A
Cited
US967849A
Cited
US1373466A
Cited
US1917606A
Cited
US1953786A
Cited
US2281610A
Cited
FR891643A
Cited
FR55753E
Cited
US2583696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |