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US3501012A
Expired / Lapsed
US
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Apparatus for continuous high filtration with a filter
Assignee: Individual
•
Filing: 1968-03-18
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Granted: 1970-03-17
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Expires: 1988-03-18
Abstract
No abstract record available.
Inventors
- 👤 Michael J Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:06
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02; B01D35/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1472896A
Cited
US3400575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |