Patent US3481480A successfully refreshed from Google Patents.
US3481480A
Expired / Lapsed
US
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Profiled rod for supporting stacked filter discs
Assignee: Enzinger Union Werke AG
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Filing: 1968-02-07
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Granted: 1969-12-02
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Expires: 1988-02-07
Abstract
No abstract record available.
Inventors
- 👤 Gunter Schwinghammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:32
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/44; B01D29/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2270370A
Cited
US3273374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |