Patent US3621641A successfully refreshed from Google Patents.
US3621641A
Expired / Lapsed
US
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Electric cleaner
Assignee: Mitsubishi Electric Corp
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Filing: 1969-11-21
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Granted: 1971-11-23
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Expires: 1989-11-21
Abstract
Abstract A FLEXIBLE FILTER FOR STRAINING OUT DIRT SUCKED THROUGH ROTATION OF AN ELECTRIC BLOWER IS DISPOSED IN OPPOSITE RELATIONSHIP WITH A ROTATABLE DUSTING LEVER SUCH THAT ONE PORTION OF THE FILTER IS SECURED TO THAT END ECCENTRIC TO THE CENTER OF ROTATION OF THE FILTER. THE FILTER IS ROTATED TO VIBRATE, EXPAND AND CONTRACT THE FILTER TO REMOVE THE DIRT STUCK TO THE FILTER FROM IT.
Inventors
- 👤 Hisao Takei
- 👤 Satoru Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:45
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/20; Y; Y10; Y10S; Y10S55/00; Y10S55/03
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |