US2180950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guided wave transmission
Assignee: AT&T Inc
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Filing: 1937-03-30
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Granted: 1939-11-21
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Expires: 1957-03-30
Abstract
No abstract record available.
Inventors
- 👤 Arnold E Bowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:15
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/26; C03B33/00; C03B33/06; C23; C23F; C23F1/00; C23F1/02; H; H01; H01P; H01P1/00; H01P1/16; H01P1/163; H04; H04B; H04B3/00; H04B3/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-11-20 | 1943-05-22 | 1943-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-20 | 1947-05-22 | 1947-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-20 | 1951-05-22 | 1951-11-21 | $7700.00 | Window Closed / Lapsed |