US2720973A
Expired / Lapsed
US
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Traveling medium gravity filter
Assignee: Barnes Drill Co
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Filing: 1954-07-12
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Granted: 1955-10-18
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Expires: 1974-07-12
Abstract
No abstract record available.
Inventors
- 👤 Maurice J Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:44
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/10; B01; B01D; B01D29/00; B01D29/09; B01D29/096; B01D29/60; B01D29/605; B01D29/88; B01D29/90; B01D33/00; B01D33/044; B01D33/06; B01D33/073; B01D35/00; B01D35/06; B01D2201/00; B01D2201/22; B03C2201/00; B03C2201/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |