US3425192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaning system
Assignee: John E Mitchell Co
•
Filing: 1966-12-12
•
Granted: 1969-02-04
•
Expires: 1986-12-12
Abstract
No abstract record available.
Inventors
- 👤 Norman E Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:24
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/16; A47L9/1616; A47L9/1625; A47L9/1641; B; B04; B04C; B04C5/00; B04C5/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1940196A
Cited
US2295984A
Cited
US2372514A
Cited
US2553175A
Cited
US2551890A
Cited
US2887177A
Cited
US3061994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |