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US2640357A
Expired / Lapsed
US
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Apparatus for the diagnosis and the control of treatment of diseases of the eye
Assignee: Individual
•
Filing: 1952-07-09
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Granted: 1953-06-02
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Expires: 1972-07-09
Abstract
No abstract record available.
Inventors
- 👤 William V Stephenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:02
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/01; A61B3/00; A61B3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1942516A
Cited
US2025534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |