US3250857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereo fm receiver
Assignee: Zenith Electronics LLC
•
Filing: 1961-10-27
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Granted: 1966-05-10
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Expires: 1981-10-27
Abstract
No abstract record available.
Inventors
- 👤 Vries Adrian J De
- 👤 Dias Flaming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:22
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22; H03D1/2209; H03D1/2218
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
IN A MONAURAL-STEREOPHONIC FREQUENCY MODULATION SYSTEM FOR USING A CARRIER SIGNAL FREQUENCY MODULATED BY MONAURAL INFORMATION OR FREQUENCY MODULATED BY STEROPHONIC INFORMATION REPRESENTED BY THE MODULATION FUNCTION
Claim 2
Dependent Claim
27 words
IN A MONAURAL-STEREOPHONIC FREQUENCY MODULATION SYSTEM FOR USING A CARRIER SIGNAL FREQUENCY MODULATED BY MONAURAL INFORMATION OR FREQUENCY MODULATED BY STEROPHONIC INFORMATION REPRESENTED BY THE MODULATION FUNCTION
References Cited (Backward Citations)
GB540185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |