US3621640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric vacuum cleaner
Assignee: Panasonic Holdings Corp
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Filing: 1969-10-08
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Granted: 1971-11-23
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Expires: 1989-10-08
Abstract
Abstract A VACUUM CLEARNER COMPRISING A BODY HOUSING AN ELECTRIC FAN AND A DUST COLLECTING VESSEL REMOVABLY MOUNTED IN SAID BODY, SAID DUST COLLECTING VESSEL HAVING A SUCTION PORT AT A FRONT END THEREOF AND A WIDELY OPEN REAR END WHERE A DUST REMOVING UNIT COMPOSED OF A PREFILTER OF ROUGH MESHES, A MAIN FILTER OF FINE MESHES AND MEANS FOR CAUSING VIBRATION OF SAID MAIN FILTER TO SHAKE OFF DUST ATTACHED THERETO IS REMOVABLY MOUNTED. THE DUST COLLECTING VESWEL IS FURTHER PROVIDED WITH A BYPASS CHANNEL WHICH COMPENSATES FOR A DECREASE OF AIR FLOW THROUGH SAID PREFILTER DUE TO DUST ACCUMULATION, WHEREBY A LARGE DUST COLLECTING CAPACITY IS OBTAINED.
Inventors
- 👤 Hiroshi Ohno
- 👤 Katuo Sawada
- 👤 Chuzi Takeda
- 👤 Kenji Okano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:11
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/14; A47L9/1409; A47L9/12; A47L9/122; Y; Y10; Y10S; Y10S55/00; Y10S55/02; 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 |