US2844799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guided wave transmission system
Assignee: AT&T Inc
•
Filing: 1955-09-15
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Granted: 1958-07-22
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Expires: 1975-09-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur G Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:26
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/19; H03; H03C; H03C7/00; H03C7/02; H03C7/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2129711A
Cited
FR980648A
Cited
US2745069A
Cited
US2719274A
Cited
US2784382A
Cited
US2760162A
Cited
US2755447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |