Patent US2487443A successfully refreshed from Google Patents.
US2487443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion arrangement for vacuum cleaners
Assignee: Eureka Williams Co
•
Filing: 1943-06-11
•
Granted: 1949-11-08
•
Expires: 1963-06-11
Abstract
No abstract record available.
Inventors
- 👤 Earl B Hough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:52
CPC Classifications
A; A47; A47L; A47L5/00; A47L5/12; A47L5/22; A47L5/28; A47L5/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1458939A
Cited
US1726592A
Cited
US2072690A
Cited
GB438622A
Cited
US2148656A
Cited
US2366481A
Cited
US2322223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |