US2521255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube with secondary intensity control of cathode rays
Assignee: Patelhold Patenverwertungs and Elektro-Holding AG
•
Filing: 1947-12-24
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Granted: 1950-09-05
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Expires: 1967-12-24
Abstract
No abstract record available.
Inventors
- 👤 Rusterholz Alexander
- 👤 Baeyer Hans Jakob Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:28
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/52; H01J31/00; H01J31/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2152825A
Cited
US2194380A
Cited
US2153269A
Cited
US2219117A
Cited
US2229766A
Cited
US2267083A
Cited
US2288239A
Cited
US2263369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |