Patent US3485378A successfully refreshed from Google Patents.
US3485378A
Expired / Lapsed
US
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Rotary drum filter with interior filter panels
Assignee: Dorr Oliver Inc
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Filing: 1967-02-23
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Granted: 1969-12-23
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Expires: 1987-02-23
Abstract
No abstract record available.
Inventors
- 👤 Arthur A Regel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:18
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/44; B01D33/46; B01D33/466; B01D33/06; B01D33/11; B01D33/70; B01D33/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1531482A
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US1848445A
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US1870442A
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US1870387A
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US2530503A
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US2963158A
Cited
US3080064A
Cited
US3229815A
Cited
US3363774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |