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Patent US2582227A successfully refreshed from Google Patents.
US2582227A
Expired / Lapsed
US
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Eye examining device having concave mirror
Assignee: Individual
•
Filing: 1948-12-27
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Granted: 1952-01-15
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Expires: 1968-12-27
Abstract
No abstract record available.
Inventors
- 👤 Frank W Brady
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:45
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US751950A
Cited
AT103985B
Cited
US1657334A
Cited
US2026010A
Cited
FR765285A
Cited
US2187057A
Cited
US2428649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-14 | 1955-07-16 | 1956-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-14 | 1959-07-16 | 1960-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-14 | 1963-07-16 | 1964-01-15 | $7700.00 | Window Closed / Lapsed |