US2840837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible electric toothbrush
Assignee: Individual
•
Filing: 1956-09-21
•
Granted: 1958-07-01
•
Expires: 1976-09-21
Abstract
No abstract record available.
Inventors
- 👤 Gustems Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:54
CPC Classifications
A; A61; A61C; A61C17/00; A61C17/16; A61C17/22; A61C17/24; A61C17/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1555522A
Cited
US2275247A
Cited
US2310626A
Cited
US2314117A
Cited
US2662239A
Cited
US2618797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |