US2421499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter for controlling light along two independent optical paths
Assignee: RCA Corp
•
Filing: 1943-11-22
•
Granted: 1947-06-03
•
Expires: 1963-11-22
Abstract
No abstract record available.
Inventors
- 👤 Emile C Guedon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:05
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/50; H04N23/55; G; G03; G03B; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US363547A
Cited
US520696A
Cited
US607242A
Cited
US1372645A
Cited
US1799879A
Cited
US2135506A
Cited
GB503901A
Cited
GB491410A
Cited
US2149743A
Cited
US2172340A
Cited
US2307479A
Cited
US2270311A
Cited
US2214228A
Cited
US2339810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |