US3134969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic data storage device
Assignee: Ex-Cell-O Corp
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Filing: 1961-08-17
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Granted: 1964-05-26
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Expires: 1981-08-17
Abstract
No abstract record available.
Inventors
- 👤 Hugh M Taft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A MAGNETIC DATA STORAGE APPARATUS COMPRISING: A TAPERED DRUM-LIKE ROTATABLE MEMBER HAVING TWO ENDS AND A PERIMETER SIDE SURFACE THEREBETWEEN, SAID MEMBER BEING VERTICALLY DISPOSED WITH ITS LARGER DIAMETER END ON TOP; AN UNBROKEN MAGNETIZABLE SURFACE LAYER ON SAID SIDE SURFACE; A SUPPORTING STRUCTURE HAVING A TAPERED BORE WHOSE INNER SURFACE IS ADJACENT TO BUT NOT TOUCHING SAID SIDE SURFACE; ELECTROMAGNETIC TRANSDUCER HEADS EMBEDDED IN SAID SUPPORTING STRUCTURE AND ADAPTED TO RECORD, READ AND ERASE MAGNETIC BITS OF DATA INFORMATION ON SAID SURFACE LAYER; MEANS ROTATING SAID ROTATABLE MEMBER; SUPPORTING MEANS MAINTAINING SAID ROTATABLE MEMBER FREELY SUSPENDED WITHIN SAID SUPPORTING STRUCTURE COMPRISING MEANS FOR INTRODUCING A PRESSURIZED FLUID WITHIN THE SPACE BETWEEN SAID SIDE SURFACE AND SAID INNER SURFACE FOR RADIAL SUPPORT, AND FURTHER COMPRISING MEANS TO INTRODUCE A PRESSURIZED FLUID WITHIN A THRUST BEARING MEANS SUPPORTING THE SMALLER DIAMETER END OF SAID ROTATABLE MEMBER; SENSING MEANS ADAPTED TO SENSE VARIATIONS OF CLEARANCE WITHIN THE SPACE
Claim 2
Dependent Claim
156 words
A MAGNETIC DATA STORAGE APPARATUS COMPRISING: A TAPERED DRUM-LIKE ROTATABLE MEMBER HAVING TWO ENDS AND A PERIMETER SIDE SURFACE THEREBETWEEN, SAID MEMBER BEING VERTICALLY DISPOSED WITH ITS LARGER DIAMETER END ON TOP; AN UNBROKEN MAGNETIZABLE SURFACE LAYER ON SAID SIDE SURFACE; A SUPPORTING STRUCTURE HAVING A TAPERED BORE WHOSE INNER SURFACE IS ADJACENT TO BUT NOT TOUCHING SAID SIDE SURFACE; ELECTROMAGNETIC TRANSDUCER HEADS EMBEDDED IN SAID SUPPORTING STRUCTURE AND ADAPTED TO RECORD, READ AND ERASE MAGNETIC BITS OF DATA INFORMATION ON SAID SURFACE LAYER; MEANS ROTATING SAID ROTATABLE MEMBER; SUPPORTING MEANS MAINTAINING SAID ROTATABLE MEMBER FREELY SUSPENDED WITHIN SAID SUPPORTING STRUCTURE COMPRISING MEANS FOR INTRODUCING A PRESSURIZED FLUID WITHIN THE SPACE BETWEEN SAID SIDE SURFACE AND SAID INNER SURFACE FOR RADIAL SUPPORT, AND FURTHER COMPRISING MEANS TO INTRODUCE A PRESSURIZED FLUID WITHIN A THRUST BEARING MEANS SUPPORTING THE SMALLER DIAMETER END OF SAID ROTATABLE MEMBER; SENSING MEANS ADAPTED TO SENSE VARIATIONS OF CLEARANCE WITHIN THE SPACE
References Cited (Backward Citations)
US2929671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |