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US2823455A
Expired / Lapsed
US
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Dental instrument
Assignee: Individual
•
Filing: 1956-04-24
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Granted: 1958-02-18
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Expires: 1976-04-24
Abstract
No abstract record available.
Inventors
- 👤 Boyd F Sprague
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:19
CPC Classifications
A; A61; A61B; A61B1/00; A61B1/24; A61B1/247; A61C; A61C17/00; A61C17/06; A61C17/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2220674A
Cited
US2459273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |