US3297831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic stereophonic phonograph pickup
Assignee: Individual
•
Filing: 1964-02-06
•
Granted: 1967-01-10
•
Expires: 1984-02-06
Abstract
No abstract record available.
Inventors
- 👤 Walter O Stanton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:29
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/08; H04R11/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A STEREOPHONIC PHONOGRAPH PICKUP OF THE MAGNETIC TYPE COMPRISING: A SUPPORTING STRUCTURE; MEANS MADE OF MAGNETIC MATERIAL SUPPORTED ON SAID SUPPORTING STRUCTURE AND PROVIDING A MAGNETIC CIRCUIT AND INCLUDING CORE MEANS AND A PAIR OF POLE PIECES CONNECTED TO RESPECTIVELY OPPOSITE END PORTIONS OF THE CORE MEANS; A PAIR OF CURRENT GENERATING MEANS INCLUDING A PAIR OF COILS MOUNTED ON SAID CORE MEANS IN SPACED RELATIONSHIP; A MOVING SYSTEM INCLUDING A RECORD ENGAGING STYLUS AND MEANS INCLUDING A MAGNETIC MEMBER FOR SUPPORTING THE STYLUS AND MOUNTED IN EQUALLY SPACED RELATIONSHIP BETWEEN THE POLE PIECES FOR OSCILLATORY MOVEMENT SO THAT A POLE OF THE MAGNETIC MEMBER CAN MOVE IN PATHS TOWARDS AND AWAY FROM THE RESPECTIVE POLE PIECES; A MAGNETIC COMPENSATOR MADE OF MAGNETIC MATERIAL EXTENDING FROM SAID CORE MEANS INTERMEDIATE SAID COILS TOWARDS SAID MAGNETIC MEMBER OF THE MOVING SYSTEM PROVIDING A MAGNETIC PATH OF LOW RELUCTANCE BETWEEN THE CORE MEANS AND THE MAGNETIC MEMBER; AND A PHASE COMPENSATOR IN THE FORM OF A COIL OF NON-MAGNETIC MATERIAL DISPOSED AROUND THE MAGNETIC COMPENSATOR.
Claim 2
Dependent Claim
173 words
A STEREOPHONIC PHONOGRAPH PICKUP OF THE MAGNETIC TYPE COMPRISING: A SUPPORTING STRUCTURE; MEANS MADE OF MAGNETIC MATERIAL SUPPORTED ON SAID SUPPORTING STRUCTURE AND PROVIDING A MAGNETIC CIRCUIT AND INCLUDING CORE MEANS AND A PAIR OF POLE PIECES CONNECTED TO RESPECTIVELY OPPOSITE END PORTIONS OF THE CORE MEANS; A PAIR OF CURRENT GENERATING MEANS INCLUDING A PAIR OF COILS MOUNTED ON SAID CORE MEANS IN SPACED RELATIONSHIP; A MOVING SYSTEM INCLUDING A RECORD ENGAGING STYLUS AND MEANS INCLUDING A MAGNETIC MEMBER FOR SUPPORTING THE STYLUS AND MOUNTED IN EQUALLY SPACED RELATIONSHIP BETWEEN THE POLE PIECES FOR OSCILLATORY MOVEMENT SO THAT A POLE OF THE MAGNETIC MEMBER CAN MOVE IN PATHS TOWARDS AND AWAY FROM THE RESPECTIVE POLE PIECES; A MAGNETIC COMPENSATOR MADE OF MAGNETIC MATERIAL EXTENDING FROM SAID CORE MEANS INTERMEDIATE SAID COILS TOWARDS SAID MAGNETIC MEMBER OF THE MOVING SYSTEM PROVIDING A MAGNETIC PATH OF LOW RELUCTANCE BETWEEN THE CORE MEANS AND THE MAGNETIC MEMBER; AND A PHASE COMPENSATOR IN THE FORM OF A COIL OF NON-MAGNETIC MATERIAL DISPOSED AROUND THE MAGNETIC COMPENSATOR.
References Cited (Backward Citations)
US2093540A
Cited
US3146319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |