US2887177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner construction
Assignee: Donaldson Co Inc
•
Filing: 1958-02-18
•
Granted: 1959-05-19
•
Expires: 1978-02-18
Abstract
No abstract record available.
Inventors
- 👤 Mark G Mund
- 👤 Dale K Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:53
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/0201; F02M35/0202; F02M35/0203; B; B01; B01D; B01D50/00; B04; B04C; B04C5/00; B04C5/24; B04C5/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1423412A
Cited
US1575292A
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US1851427A
Cited
US2251790A
Cited
US2295984A
Cited
US2490959A
Cited
US2519897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |