US3415735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for removing contaminants from high-resistivity fluids
Assignee: Research Cottrell Inc
•
Filing: 1964-09-23
•
Granted: 1968-12-10
•
Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Robert F Brown
- 👤 Herbert J Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:30
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/06; B03; B03C; B03C5/00; B03C5/02; B03C5/022; B03C5/024
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1414079A
Cited
US2798572A
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US3190827A
Cited
US3252885A
Cited
US3252884A
Cited
US3324026A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |