US2611836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental engine control
Assignee: WM O BALLARD
•
Filing: 1949-09-27
•
Granted: 1952-09-23
•
Expires: 1969-09-27
Abstract
No abstract record available.
Inventors
- 👤 Howard E Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:06
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/02; H01H13/12; H01H13/14; H01H13/16; A; A61; A61C; A61C1/00; A61C1/0007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US543855A
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US603524A
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US1040577A
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US1856869A
Cited
US2114196A
Cited
US2404644A
Cited
US2482550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-23 | 1956-03-24 | 1956-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-23 | 1960-03-24 | 1960-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-23 | 1964-03-24 | 1964-09-23 | $7700.00 | Window Closed / Lapsed |