Patent US4223788A successfully refreshed from Google Patents.
Patent US2663335A successfully refreshed from Google Patents.
Patent US2817456A successfully refreshed from Google Patents.
US2817456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal cones for cathode ray tubes
Assignee: RCA Corp
•
Filing: 1951-02-24
•
Granted: 1957-12-24
•
Expires: 1971-02-24
Abstract
No abstract record available.
Inventors
- 👤 Harry R Seelen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:34
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/861; H01J9/00; H01J9/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2035408A
Cited
US2219574A
Cited
US2232098A
Cited
US2236708A
Cited
US2254090A
Cited
US2517584A
Cited
US2682963A
Cited
US2782953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |