US3171897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fm stereo multiplex test instrument
Assignee: RCA Corp
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Filing: 1962-11-29
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Granted: 1965-03-02
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Expires: 1982-11-29
Abstract
No abstract record available.
Inventors
- 👤 Wlasuk Steven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:36
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/44; H04H20/46; H04H20/47; H04H20/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN A TEST INSTRUMENT FOR STEREOPHONIC FREQUENCY MODULATION TRECEIVES, MEANS FOR PRODUCING A COMPOSITE WAVE COMPRISING MEANS FOR REPRODUCING THE SUPPRESSED SUBCARRIER MODULATION PRODUCTS OF AN AUDIO WAVE AND A SUBCARRIER, WAVE, MEANS FOR ADDING SAID AUDIO WAVE TO SAID MODULATION PRODUCTS, MEANS FOR PRODUCING A PILOT WAVE OF SUBHARMONIC FREQUENCY WITH RESPECT TO SAID SUBCARRIER WAVE, PHASE SHIFTING MEANS COUPLED TO SAID PILOT WAVE PRODUCING MEANS FOR PROVIDING SAID PILOT WAVE AT A PLURALITY OF DIFFERENT TIME RELATIONS WITH RESPECT TO SAID SUBCARRIER WAVE, A FIRST OF SAID TIME RELATIONS CORRESPONDING TO A PILOT WAVE WHEREOF THE AMPLITUDE PASSES THROUGH ZERO SUBSTANTIALLY SIMULTANEOUSLY WITH PASSAGE OF SAID SUBCARRIER WAVE THROUGH A MAXIMUM AMPLITUDE, AND SECOND AND
Claim 2
Dependent Claim
117 words
IN A TEST INSTRUMENT FOR STEREOPHONIC FREQUENCY MODULATION TRECEIVES, MEANS FOR PRODUCING A COMPOSITE WAVE COMPRISING MEANS FOR REPRODUCING THE SUPPRESSED SUBCARRIER MODULATION PRODUCTS OF AN AUDIO WAVE AND A SUBCARRIER, WAVE, MEANS FOR ADDING SAID AUDIO WAVE TO SAID MODULATION PRODUCTS, MEANS FOR PRODUCING A PILOT WAVE OF SUBHARMONIC FREQUENCY WITH RESPECT TO SAID SUBCARRIER WAVE, PHASE SHIFTING MEANS COUPLED TO SAID PILOT WAVE PRODUCING MEANS FOR PROVIDING SAID PILOT WAVE AT A PLURALITY OF DIFFERENT TIME RELATIONS WITH RESPECT TO SAID SUBCARRIER WAVE, A FIRST OF SAID TIME RELATIONS CORRESPONDING TO A PILOT WAVE WHEREOF THE AMPLITUDE PASSES THROUGH ZERO SUBSTANTIALLY SIMULTANEOUSLY WITH PASSAGE OF SAID SUBCARRIER WAVE THROUGH A MAXIMUM AMPLITUDE, AND SECOND AND
References Cited (Backward Citations)
US3122610A
Cited
US3120580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |