US3521200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined unit of impedance
Assignee: TDK Corp
•
Filing: 1966-08-22
•
Granted: 1970-07-21
•
Expires: 1986-08-22
Abstract
No abstract record available.
Inventors
- 👤 Mitsuo Matsushima
- 👤 Shigeaki Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:47
CPC Classifications
H; H01; H01G; H01G2/00; H03; H03H; H03H5/00; H03H5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3046452A
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US2569036A
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US2613268A
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US2626318A
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US2631193A
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US2599068A
Cited
US2759155A
Cited
US3109983A
Cited
US3111612A
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US3076947A
Cited
US3200355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |