Patent US4885700A successfully refreshed from Google Patents.
Patent US3190971A successfully refreshed from Google Patents.
US3190971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reproduction apparatus
Assignee: Individual
•
Filing: 1959-08-17
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Granted: 1965-06-22
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Expires: 1979-08-17
Abstract
No abstract record available.
Inventors
- 👤 Herman H Lowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:51
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/44; G11B3/52
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
A TRANSDUCER FOR PRODUCING A VARYING VOLTAGE IN AN ELECTRICAL CIRCUIT WHICH IS A FUNCTION OF IRREGULARITIES IN A GROOVE FORMED IN A RECORDING DISK, SAID DISK HAVING UNIFORMLY SPACED WALLS IN A SPIRAL PATTERN, SAID GROOVE BEING FORMED IN THE AREA BETWEEN SAID WALLS, SAID TRANSDUCER COMPRISING A VOLTAGE-PRODUCING ELEMENT ACTUATED BY MOVEMENT, A STYLUS BEING MECHANICALLY JOINED TO SAID ELEMENT AND ENGAGING SAID GROOVE, A CARTRIDGE FOR CONTAINING SAID ELEMENT AND HOLDING NON-MOVING PARTS, AND A SECOND STYLUS CONNECTED TO SAID CARTRIDGE AND ENGAGING SAID DISK AND SAID WALLS FOR SUPPORTING AND GUIDING SAID TRANSDUCER AS SAID DISK IS ROTATED.
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) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |