Patent US4907275A successfully refreshed from Google Patents.
Patent US3142729A successfully refreshed from Google Patents.
US3142729A
Expired / Lapsed
US
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Phonograph reproducer
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1957-12-10
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Granted: 1964-07-28
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Expires: 1977-12-10
Abstract
No abstract record available.
Inventors
- 👤 Charles C Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:01
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/12; H04R9/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
159 words
IN A PHONOGRAPH PICKUP DEVICE FOR PLAYING BACK A RECORD GROOVE CONTAINING TWO DIFFERENT RECORD UNDULATION SEQUENCES EXTENDING ALONG DIFFERENT TRANSVERSE SEGMENTS OF THE GROOVE, A STYLUS ARRANGED TO ENGAGE THE RECORD GROOVE AND TO BE DRIVEN BY BOTH ITS UNDULATION SEQUENCES, AND A MOVING SYSTEM INCLUDING AT LEAST TWO MECHANOELECTRIC TRANSDUCER ELEMENTS EACH HAVING A MOTION-TRANSMITTING CONNECTION TO SAID STYLUS AND OPERATIVE TO TRANSDUCE TRANSMITTED MOTION OF SAID STYLUS INTO ELECTRIC SIGNALS, A MOUNTING STRUCTURE CARRYING SAID MOVING SYSTEM AND SAID STYLUS IN THEIR OPERATIVE POSITIONS AND SUPPORTING SAID STYLUS FOR VIBRATION SIMULTANEOUSLY IN TWO DIFFERENT TRANSVERSE PLANES, SAID MOVING SYSTEM HAVING TWO RELATIVELY RIGID DRIVE LINKS, ONE FOR EACH TRANSDUCER ELEMENT, WITH EACH DRIVE LINK EXTENDING IN A DIFFERENT DIRECTION FROM AND HAVING A PIVOTAL MOTION-TRANSMITTING CONNECTION TO SAID STYLUS FOR TRANSMITTING MOTION OF SAID STYLUS TO ITS TRANSDUCER ELEMENTS AND A GUIDED PORTION AT A DISTANCE FROM SAID STYLUS, TWO DISTINCT ELEMENTS OF SAID MOVING SYS-
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-28 | 1968-01-27 | 1968-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-28 | 1972-01-27 | 1972-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-28 | 1976-01-27 | 1976-07-28 | $7700.00 | Window Closed / Lapsed |