US2423130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching device in wave guide transmission system
Assignee: AT&T Inc
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Filing: 1944-03-25
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Granted: 1947-07-01
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Expires: 1964-03-25
Abstract
No abstract record available.
Inventors
- 👤 Warren A Tyrrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:00
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/10; H01P1/12; H01P1/122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-30 | 1950-12-30 | 1951-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-30 | 1954-12-30 | 1955-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-30 | 1958-12-30 | 1959-07-01 | $7700.00 | Window Closed / Lapsed |