Patent US2742105A successfully refreshed from Google Patents.
US2742105A
Expired / Lapsed
US
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Device for preventing dust from being drawn into a vacuum cleaner when filter bag is not in place
Assignee: AIR WAY IND Inc
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Filing: 1953-12-11
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Granted: 1956-04-17
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Expires: 1973-12-11
Abstract
No abstract record available.
Inventors
- 👤 Dewey M Dow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:27
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/14; A47L9/1427; A47L9/1472; Y; Y10; Y10S; Y10S292/00; Y10S292/65; Y10S55/00; Y10S55/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE429351C
Cited
US2322948A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |