US2573553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overlapping header for radio tubes
Assignee: GTE Sylvania Inc
•
Filing: 1946-09-28
•
Granted: 1951-10-30
•
Expires: 1966-09-28
Abstract
No abstract record available.
Inventors
- 👤 Robert F Doran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:18
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; H01J5/24; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0038; H01J2893/0039; Y; Y10; Y10T; Y10T403/00; Y10T403/70
Claims Analysis
Total Claims: 0
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US2275490A
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US2334123A
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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) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |