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US3506776A
Expired / Lapsed
US
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Balanced product mixer or demodulator and matrixing system for wave signal receivers
Assignee: Zenith Electronics LLC
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Filing: 1967-04-10
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Granted: 1970-04-14
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Expires: 1987-04-10
Abstract
No abstract record available.
Inventors
- 👤 John L Rennick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:48
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22; H03D1/24; H04; H04N; H04N9/00; H04N9/64; H04N9/66
Claims Analysis
Total Claims: 0
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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) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |