Patent US2453335A successfully refreshed from Google Patents.
US2453335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color blindness chart for detecting anomalous vision, deuteranopes, protanopes, tritanopes, and monochromats
Assignee: Eastman Kodak Co
•
Filing: 1944-10-27
•
Granted: 1948-11-09
•
Expires: 1964-10-27
Abstract
No abstract record available.
Inventors
- 👤 Morris Reginald Burford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:03
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/06; A61B3/066
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-09 | 1952-05-10 | 1952-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-09 | 1956-05-10 | 1956-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-09 | 1960-05-10 | 1960-11-09 | $7700.00 | Window Closed / Lapsed |