US3410055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable bed filter and method
Assignee: DUCON CO
•
Filing: 1966-10-25
•
Granted: 1968-11-12
•
Expires: 1986-10-25
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Zenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/30; B01D46/32; B01J; B01J8/00; B01J8/005; B01J8/006; B01J8/0065; B01D2273/00; B01D2273/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US989665A
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DE381500C
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FR26145E
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DE522573C
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US2145049A
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US2493356A
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US2488493A
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US2639000A
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FR1062580A
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FR1146213A
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FR1176086A
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US3016147A
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US3296775A
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GB984844A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |