US2366554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eye testing apparatus
Assignee: American Optical Corp
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Filing: 1942-04-10
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Granted: 1945-01-02
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Expires: 1962-04-10
Abstract
No abstract record available.
Inventors
- 👤 William F Peck
- 👤 Albin A Gradisar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:41
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/028; A61B3/032
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-01-02 | 1948-07-03 | 1949-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-01-02 | 1952-07-03 | 1953-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-01-02 | 1956-07-03 | 1957-01-02 | $7700.00 | Window Closed / Lapsed |