US2420633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument for testing and developing the stereoptic acuity of a person's eyes
Assignee: Eastman Kodak Co
•
Filing: 1943-09-02
•
Granted: 1947-05-13
•
Expires: 1963-09-02
Abstract
No abstract record available.
Inventors
- 👤 Wittel Otto
- 👤 George J Koch
- 👤 Joseph L Boon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:28
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/08
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-12 | 1950-11-11 | 1951-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-12 | 1954-11-11 | 1955-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-12 | 1958-11-11 | 1959-05-13 | $7700.00 | Window Closed / Lapsed |