Patent US3820189A successfully refreshed from Google Patents.
US3820189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brush adaptor for vacuuming
Assignee: Individual
•
Filing: 1972-12-11
•
Granted: 1974-06-28
•
Expires: 1992-12-11
Abstract
Abstract A SLANT PILE BRUSH SURROUNDS AN APERTURE TO A CHAMBER WHICH IS CONNECTIBLE TO A VACUUM SOURCE
Inventors
- 👤 E Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:25
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |