Patent US2434427A successfully refreshed from Google Patents.
US2434427A
Expired / Lapsed
US
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Device for cleaning filters
Assignee: Individual
•
Filing: 1938-04-21
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Granted: 1948-01-13
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Expires: 1958-04-21
Abstract
No abstract record available.
Inventors
- 👤 Muller Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:01
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US391328A
Cited
US395625A
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US530008A
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US582432A
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US656043A
Cited
DE341183C
Cited
US1784103A
Cited
US2068468A
Cited
US2134385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-12 | 1951-07-14 | 1952-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-12 | 1955-07-14 | 1956-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-12 | 1959-07-14 | 1960-01-13 | $7700.00 | Window Closed / Lapsed |