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US3219351A Expired / Lapsed US ⏱️ 0.0 years remaining

Tone arm lift

Assignee: Dyna Empire Inc
•
Filing: 1961-11-13
•
Granted: 1965-11-23
•
Expires: 1981-11-13
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Abstract

No abstract record available.

Inventors

  • 👤 Harry B Shaper
  • 👤 John C Shannon

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 12:34
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/12; G11B3/14

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 272 words
IN COMBINATION A PHONOGRAPH TURNTABLE, SUPPORT MEANS, MEANS ROTATABLY MOUNTING SAID TURNTABLE TO SAID SUPPORT MEANS ON A FIRST SIDE THEREOF, A TONE ARM, FIRST MEANS EXTENDING ABOVE SAID FIRST SIDE AND MOUNTING SAID TONE ARM NEAR THE REAR OF SAID TONE ARM TO SAID SUPPORT MEANS, SAID FIRST MEANS DEFINING VERTICAL AND HORIZONTAL PIVOTAL AXES FOR SAID TONE ARM WITH SAID HORIZONTAL AXIS PIVOTABLE ABOUT SAID VERTICAL AXIS, A PICKUP CARTRIDGE INCLUDING A STYLUS MOUNTED TO SAID TONE ARM NEAR THE FRONT THEREOF, SECOND MEANS INCLUDING A FIRST AND A SECOND SECTION, SAID FIRST SECTION INCLUDING A MAGNET FOR LIFTING SAID STYLUS FREE OF A DISC RECORD ON SAID TURNTABLE WHEN SAID TONE ARM HAS REACHED A PREDETERMINED ANGULAR POSITION WHERE THE STYLUS IS AT A POINT ON THIS RECORD BETWEEN THE CENTER OF THE RECORD AND THE SOUND GROOVE POSITIONED CLOSEST TO THE CENTER, SAID FIRST SECTION ALSO INCLUDING A HOUSING CONSTRUCTED OF MATERIAL HAVING HIGH MAGNETIC PERMEABILITY, SAID MAGNET BEING DISPOSED WITHIN SAID HOUSING, SAID SECOND SECTION INCLUDING A MAGNETIC MEMBER, ONE OF SAID SECTIONS MOUNTED TO SAID TONE ARM AND THE OTHER OF SAID SECTIONS MOUNTED TO SAID SUPPORT MEANS AND EXTENDING ABOVE SAID FIRST SIDE, SAID HOUSING CONSTRUCTED AND POSITIONED SUCH THAT SAID MAGNET IS INEFFECTUAL TO EXERT A FORCE ON SAID MAGNETIC MEMBER WHILE SAID STYLUS IS IN A SOUND GROOVE OF A RECORD ON SAID TURNTABLE AND IS POSITIONED SUCH THAT THE MAGNET EXERTS A FORCE ON THE MAGNETIC MEMBER LIFTING SAID TONE ARM AFTER SAID STYLUS HAS MOVED PAST THE END OF SUCH SOUND GROOVE CLOSEST TO THE AXIS OF ROTATION FOR THE TURNTABLE.
Claim 2
Dependent Claim 272 words
IN COMBINATION A PHONOGRAPH TURNTABLE, SUPPORT MEANS, MEANS ROTATABLY MOUNTING SAID TURNTABLE TO SAID SUPPORT MEANS ON A FIRST SIDE THEREOF, A TONE ARM, FIRST MEANS EXTENDING ABOVE SAID FIRST SIDE AND MOUNTING SAID TONE ARM NEAR THE REAR OF SAID TONE ARM TO SAID SUPPORT MEANS, SAID FIRST MEANS DEFINING VERTICAL AND HORIZONTAL PIVOTAL AXES FOR SAID TONE ARM WITH SAID HORIZONTAL AXIS PIVOTABLE ABOUT SAID VERTICAL AXIS, A PICKUP CARTRIDGE INCLUDING A STYLUS MOUNTED TO SAID TONE ARM NEAR THE FRONT THEREOF, SECOND MEANS INCLUDING A FIRST AND A SECOND SECTION, SAID FIRST SECTION INCLUDING A MAGNET FOR LIFTING SAID STYLUS FREE OF A DISC RECORD ON SAID TURNTABLE WHEN SAID TONE ARM HAS REACHED A PREDETERMINED ANGULAR POSITION WHERE THE STYLUS IS AT A POINT ON THIS RECORD BETWEEN THE CENTER OF THE RECORD AND THE SOUND GROOVE POSITIONED CLOSEST TO THE CENTER, SAID FIRST SECTION ALSO INCLUDING A HOUSING CONSTRUCTED OF MATERIAL HAVING HIGH MAGNETIC PERMEABILITY, SAID MAGNET BEING DISPOSED WITHIN SAID HOUSING, SAID SECOND SECTION INCLUDING A MAGNETIC MEMBER, ONE OF SAID SECTIONS MOUNTED TO SAID TONE ARM AND THE OTHER OF SAID SECTIONS MOUNTED TO SAID SUPPORT MEANS AND EXTENDING ABOVE SAID FIRST SIDE, SAID HOUSING CONSTRUCTED AND POSITIONED SUCH THAT SAID MAGNET IS INEFFECTUAL TO EXERT A FORCE ON SAID MAGNETIC MEMBER WHILE SAID STYLUS IS IN A SOUND GROOVE OF A RECORD ON SAID TURNTABLE AND IS POSITIONED SUCH THAT THE MAGNET EXERTS A FORCE ON THE MAGNETIC MEMBER LIFTING SAID TONE ARM AFTER SAID STYLUS HAS MOVED PAST THE END OF SUCH SOUND GROOVE CLOSEST TO THE AXIS OF ROTATION FOR THE TURNTABLE.

References Cited (Backward Citations)

US2939715A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1968-11-22 1969-05-24 1969-11-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1972-11-22 1973-05-24 1973-11-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1976-11-22 1977-05-24 1977-11-23 $7700.00 Window Closed / Lapsed

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