Patent JPS588428A successfully refreshed from Google Patents.
Patent US2820222A successfully refreshed from Google Patents.
US2820222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna tuner
Assignee: AERONAUTICAL COMM EQUIPMENT IN
•
Filing: 1954-05-04
•
Granted: 1958-01-14
•
Expires: 1974-05-04
Abstract
No abstract record available.
Inventors
- 👤 William E Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:43
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/40
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |