Patent US2620863A successfully refreshed from Google Patents.
US2620863A
Expired / Lapsed
US
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Dental stool extension for feet and motor control support
Assignee: Individual
•
Filing: 1949-07-26
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Granted: 1952-12-09
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Expires: 1969-07-26
Abstract
No abstract record available.
Inventors
- 👤 John E Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:56
CPC Classifications
A; A61; A61B; A61B90/00; A61B90/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1119408A
Cited
DE528171C
Cited
US2424729A
Cited
US2449385A
Cited
US2482885A
Cited
US2596561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |