Patent US3372811A successfully refreshed from Google Patents.
US3372811A
Expired / Lapsed
US
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Rotating drum filter apparatus
Assignee: Ajem Laboratories Inc
•
Filing: 1964-04-16
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Granted: 1968-03-12
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Expires: 1984-04-16
Abstract
No abstract record available.
Inventors
- 👤 Orlan M Arnold
- 👤 Jr Frederick W Koepke
- 👤 James M Stewart
- 👤 Laslo Henry Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:03
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/16; B01D33/00; B01D33/044; B01D33/048; B01D33/44; B01D33/46; B01D33/463; B01D33/80; B01D33/801
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US736596A
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US775475A
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US1451521A
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US1797248A
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US2823806A
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US2916145A
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US3206030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |