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Patent US3488593A successfully refreshed from Google Patents.
US3488593A
Expired / Lapsed
US
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Frequency converter circuit changeable to an audio frequency amplifier
Assignee: Nihon Victor KK
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Filing: 1965-11-19
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Granted: 1970-01-06
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Expires: 1985-11-19
Abstract
No abstract record available.
Inventors
- 👤 Takuro Bojo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:32
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/16; H04B1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2488936A
Cited
US2548531A
Cited
US2558820A
Cited
US2836663A
Cited
US2886653A
Cited
US2950356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |