US3478883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic filtration apparatus
Assignee: Amsalco Inc
•
Filing: 1967-04-13
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Granted: 1969-11-18
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Expires: 1987-04-13
Abstract
No abstract record available.
Inventors
- 👤 Frank P Deluca Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:19
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/60; B01D29/606; B01D29/62; B01D29/66; B01D29/668; B01D29/70; B01D29/72; B01D29/76; B01D29/86; B01D29/865; B01D35/00; B01D35/12; B01D35/20; B01D2201/00; B01D2201/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2392666A
Cited
GB555324A
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US2569748A
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US2769506A
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US2742158A
Cited
US2982412A
Cited
US3002915A
Cited
US3161591A
Cited
US3276593A
Cited
US3284991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |