Patent US2657321A successfully refreshed from Google Patents.
US2657321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power-driven toothbrush
Assignee: Individual
•
Filing: 1950-11-09
•
Granted: 1953-10-27
•
Expires: 1970-11-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles B Smithson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
A; A61; A61C; A61C17/00; A61C17/16; A61C17/22; A61C17/40
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |