Patent US2591772A successfully refreshed from Google Patents.
US2591772A
Expired / Lapsed
US
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Locking device for contraangle handpieces
Assignee: Individual
•
Filing: 1947-03-15
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Granted: 1952-04-08
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Expires: 1967-03-15
Abstract
No abstract record available.
Inventors
- 👤 Bjorklund Gustaf Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:41
CPC Classifications
A; A61; A61C; A61C1/00; A61C1/08; A61C1/14; A61C1/141
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US467799A
Cited
DE390503C
Cited
US1678097A
Cited
GB372713A
Cited
US2231969A
Cited
US2180499A
Cited
US2485766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |