US2552009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expanded sweep and calibrated cathode-ray tube trace
Assignee: National Research Development Corp UK
•
Filing: 1947-07-30
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Granted: 1951-05-08
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Expires: 1967-07-30
Abstract
No abstract record available.
Inventors
- 👤 Laws Cecil Alfred
- 👤 Pumphrey Richard Julius
- 👤 Ratsey Osbert Linn
- 👤 Watson Daniel Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:36
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |