Patent US2867778A successfully refreshed from Google Patents.
US2867778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface wave transmission line coupler
Assignee: Individual
•
Filing: 1953-10-12
•
Granted: 1959-01-06
•
Expires: 1973-10-12
Abstract
No abstract record available.
Inventors
- 👤 Hafner Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:03
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1962-01-05 | 1962-07-07 | 1963-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-05 | 1966-07-07 | 1967-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-05 | 1970-07-07 | 1971-01-06 | $7700.00 | Window Closed / Lapsed |