US2878893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collector
Assignee: Individual
•
Filing: 1955-10-03
•
Granted: 1959-03-24
•
Expires: 1975-10-03
Abstract
No abstract record available.
Inventors
- 👤 Walter M Madsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:14
CPC Classifications
B; B04; B04C; B04C3/00; B04C3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US408074A
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US948062A
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FR424561A
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US1077947A
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US1600762A
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US1735298A
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US1958577A
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DE661079C
Cited
US2147671A
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US2413324A
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US2333961A
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US2542635A
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GB637962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |