Patent US2648061A successfully refreshed from Google Patents.
US2648061A
Expired / Lapsed
US
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Cathode-ray tube display system
Assignee: National Research Development Corp UK
•
Filing: 1947-12-29
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Granted: 1953-08-04
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Expires: 1967-12-29
Abstract
No abstract record available.
Inventors
- 👤 Parker Eric
- 👤 Peter R Wallis
- 👤 Woroncow Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:40
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01S7/06; G01S7/20; G01S7/40; G01S7/4004; G01S7/4026; G01S7/403; G01S7/4034
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) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |