US2492224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semitransparent reflecting filter for cathode-ray tubes
Assignee: Sightmaster Corp
•
Filing: 1948-03-09
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Granted: 1949-12-27
•
Expires: 1968-03-09
Abstract
No abstract record available.
Inventors
- 👤 Kaplan Joseph
- 👤 Michael L Kaplan
- 👤 Williams Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:47
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J2229/00; H01J2229/89; H01J2229/893
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1967161A
Cited
GB457274A
Cited
US2222414A
Cited
GB483841A
Cited
US2251984A
Cited
US2224287A
Cited
US2426752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |