US2923200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eye testing instruments
Assignee: American Optical Corp
•
Filing: 1956-03-29
•
Granted: 1960-02-02
•
Expires: 1976-03-29
Abstract
No abstract record available.
Inventors
- 👤 John R Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:40
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/028; A61B3/0285
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US749046A
Cited
GB190124620A
Cited
US1842458A
Cited
US2095235A
Cited
US2147957A
Cited
US2266797A
Cited
US2337898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |