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Patent US2788901A successfully refreshed from Google Patents.
US2788901A
Expired / Lapsed
US
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Fused edge filter unit
Assignee: American Felt Co
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Filing: 1954-10-11
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Granted: 1957-04-16
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Expires: 1974-10-11
Abstract
No abstract record available.
Inventors
- 👤 Boeddinghaus Hugo
- 👤 Arthur C Wrotnowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:22
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D29/00; B01D29/11; B01D29/111; B01D29/39; B01D29/395; B01D29/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2374755A
Cited
US2444147A
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US2443087A
Cited
US2576864A
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US2521984A
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US2654440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |