US3383841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filter
Assignee: Donaldson Co Inc
•
Filing: 1966-02-21
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Granted: 1968-05-21
•
Expires: 1986-02-21
Abstract
No abstract record available.
Inventors
- 👤 Lawrence J Olson
- 👤 Erland D Anderson
- 👤 Donald D Gronholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:46
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/06; B01D46/10; B01D46/12; B01D46/121
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US272582A
Cited
US2016033A
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FR896609A
Cited
US2453206A
Cited
US2662610A
Cited
DE1094206B
Cited
US2907406A
Cited
US3023447A
Cited
FR1320200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |