US3015789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical filter
Assignee: Toyo Communication Co Ltd
•
Filing: 1957-04-16
•
Granted: 1962-01-02
•
Expires: 1977-04-16
Abstract
No abstract record available.
Inventors
- 👤 Honda Seiichi
- 👤 Nakazawa Yuzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:06
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/58; H03H9/542
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1644004A
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US1781469A
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US1954516A
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US2276013A
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US2345491A
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US2342869A
Cited
US2596460A
Cited
US2570579A
Cited
US2906973A
Cited
US2821686A
Cited
US2814785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-01 | 1965-07-03 | 1966-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-01 | 1969-07-03 | 1970-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-01 | 1973-07-03 | 1974-01-02 | $7700.00 | Window Closed / Lapsed |