US3609946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric suction cleaner
Assignee: Hitachi Ltd
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Filing: 1968-06-28
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Granted: 1971-10-05
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Expires: 1988-06-28
Abstract
Abstract AN ELECTRIC SUCTION CLEANER WHICH IS SO DESIGNED THAT THE DUST COLLECTED IN A DUST CASE FROM A DUST-CONTAINING AIR FLOW IS COMPRESSED BY THE ENERGY OF THE DUST-CONTAINING AIR FLOW SO AS TO INCREASE THE DUST COLLECTING CAPACITY OF THE DUST CASE, THE DUST CASE BEING COMPOSED OF SUBSTANTIAL- LY NON-AIR PERMEABLE WALLS EXCEPT FOR THE PORTIONS WHERE INLET MEANS FOR THE DUST-CONTAINING AIR AND FILTER MEANS FOR COLLECTING THE DUST FROM THE DUST-CONTAINING AIR ARE PROVIDED.
Inventors
- 👤 Hisashi Nakagawa
- 👤 Hajime Mizuno
- 👤 Hideya Koshiyama
- 👤 Goro Sasai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:01
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/14; A47L9/1409; A47L9/0081; A47L9/102; A47L9/20
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |