US3028564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical filter
Assignee: Kokusai Denki Electric Inc
•
Filing: 1960-06-14
•
Granted: 1962-04-03
•
Expires: 1980-06-14
Abstract
No abstract record available.
Inventors
- 👤 Tanaka Tetsuro
- 👤 Tagawa Yasuo
- 👤 Kuyama Katsumasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:25
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; H03H9/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2803803A
Cited
US2615981A
Cited
US2712753A
Cited
US2695357A
Cited
US2762985A
Cited
US2774035A
Cited
US2821686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-02 | 1965-10-02 | 1966-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-02 | 1969-10-02 | 1970-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-02 | 1973-10-02 | 1974-04-03 | $7700.00 | Window Closed / Lapsed |