US3134097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data storage machine
Assignee: International Business Machines Corp
•
Filing: 1954-12-24
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Granted: 1964-05-19
•
Expires: 1974-12-24
Abstract
No abstract record available.
Inventors
- 👤 Louis D Stevens
- 👤 William A Goddard
- 👤 John J Lynott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:14
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/06; G06F3/08; G11; G11B; G11B25/00; G11B25/04; G11B25/043; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A RANDOM ACCESS MAGNETIC MEMORY DEVICE COMPRISING A PLURALITY OF MAGNETIC DISCS MOUNTED FOR ROTATION UPON A COMMON SHAFT, EACH OF SAID DISCS HAVING A PLURALITY OF CONCENTRIC RECORDING TRACKS ON BOTH OF ITS SURFACES, MEANS FOR CONTINUOUSLY ROTATING SAID SHAFT TO ROTATE SAID DISCS, A TRANSDUCER FOR RECORDING AND REPRODUCING DATA ON SAID TRACKS, MEANS FOR MOVING SAID TRANSDUCER AXIALLY OF SAID DISCS TO SELECTIVELY POSITION SAID TRANSDUCER BETWEEN A SELECTED PAIR OF ADJACENT DISCS, MEANS OPERABLE UPON COMPLETION OF SAID AXIAL POSITIONING OF SAID TRANSDUCER TO MOVE SAID TRANSDUCER RADIALLY BETWEEN SAID SELECTED DISCS TO POSITION SAID TRANSDUCER ADJACENT A SELECTED ONE OF SAID RECORDING TRACKS, AND MEANS RESPONSIVE TO COMPLETION OF SAID RADIAL POSITIONING OPERATION FOR ENERGIZING SAID TRANSDUCER TO MAGNETICALLY COOPERATE WITH SAID SELECTED TRACK.
Claim 2
Dependent Claim
129 words
A RANDOM ACCESS MAGNETIC MEMORY DEVICE COMPRISING A PLURALITY OF MAGNETIC DISCS MOUNTED FOR ROTATION UPON A COMMON SHAFT, EACH OF SAID DISCS HAVING A PLURALITY OF CONCENTRIC RECORDING TRACKS ON BOTH OF ITS SURFACES, MEANS FOR CONTINUOUSLY ROTATING SAID SHAFT TO ROTATE SAID DISCS, A TRANSDUCER FOR RECORDING AND REPRODUCING DATA ON SAID TRACKS, MEANS FOR MOVING SAID TRANSDUCER AXIALLY OF SAID DISCS TO SELECTIVELY POSITION SAID TRANSDUCER BETWEEN A SELECTED PAIR OF ADJACENT DISCS, MEANS OPERABLE UPON COMPLETION OF SAID AXIAL POSITIONING OF SAID TRANSDUCER TO MOVE SAID TRANSDUCER RADIALLY BETWEEN SAID SELECTED DISCS TO POSITION SAID TRANSDUCER ADJACENT A SELECTED ONE OF SAID RECORDING TRACKS, AND MEANS RESPONSIVE TO COMPLETION OF SAID RADIAL POSITIONING OPERATION FOR ENERGIZING SAID TRANSDUCER TO MAGNETICALLY COOPERATE WITH SAID SELECTED TRACK.
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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) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |