US2863127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic wave equalization system
Assignee: AT&T Inc
•
Filing: 1953-12-31
•
Granted: 1958-12-02
•
Expires: 1973-12-31
Abstract
No abstract record available.
Inventors
- 👤 Walter J Albersheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:15
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/165; H01P1/18; H01P1/182; H01P9/00; H01P9/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2563612A
Cited
US2607849A
Cited
US2514779A
Cited
US2577146A
Cited
US2644930A
Cited
US2767379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |