US3606016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering method and apparatus therefor
Assignee: Individual
•
Filing: 1969-12-18
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Granted: 1971-09-20
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Expires: 1989-12-18
Abstract
Abstract A filtering method in which the filtration of impurity particles from a liquid is performed by causing the liquid and impurity particles contained therein to flow along a path having a preselected angle with respect to the longitudinal axis of a filter medium whereby impurity particles having grain sizes larger than the effective diameter of the pores of the filter medium are not able to pass through the pores, the intended degree of purification of the liquid thereby being achieved.
Inventors
- 👤 Jiro Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:26
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/22; B01D29/00; B01D29/11; B01D29/117; B01D29/118; B01D29/31; B01D29/35; B01D29/356; B01D29/50; B01D29/52; B01D29/60; B01D29/603; B01D29/88; B01D29/94; B01D29/945; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0453; B01D2201/28; B01D2201/287
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |