US4720292B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
US4720292B2 - - Google Patents
Assignee: Donaldson Co Inc
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Filing: 1986-07-14
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Granted: 1994-02-22
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Expires: 2006-07-14
Abstract
No abstract record available.
Inventors
- 👤 F. Engel Donald
- 👤 S. Gieseke Steven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/24; B01D46/2403; B01D46/2411; B01D46/2414; B01D2271/00; B01D2271/02; B01D2271/022; B01D2271/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-21 | 1997-08-23 | 1998-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-21 | 2005-08-23 | 2006-02-22 | $7700.00 | Window Closed / Lapsed |