Patent US4376960A successfully refreshed from Google Patents.
US4376960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible disk stabilizing structure
Assignee: International Business Machines Corp
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Filing: 1980-12-31
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Granted: 1983-03-15
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Expires: 2000-12-31
Abstract
Abstract A magnetic recording device for non-contact recording on a flexible disk employs a Bernoulli plate to stabilize the rotating disk. The plate is slightly concave and has a number of small orifices therein through which air is drawn by the disk rotation to produce a thin, cushion of air between the plate and the disk.
Inventors
- 👤 Kenneth N. Karol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:56
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B17/00; G11B17/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
Apparatus for magnetically recording and reproducing electrical signals, comprising a flexible disk having a magnetic recording material on at least one surface thereof; a Bernoulli plate member positioned adjacent said disk surface having the magnetic recording material thereon; said plate member being concave in one direction and having a plurality of orifices therein through which air is drawn when said disk is rotating; said orifices being aligned radially outwardly from the center of said plate member, adjacent radial lines of said orifices being offset radially from each other, said plate member having a transducer opening therein for location of transducing means to magnetically cooperate with said disk in a non-contact transducing relationship.
Claim 2
Dependent Claim
112 words
Apparatus for magnetically recording and reproducing electrical signals, comprising a flexible disk having a magnetic recording material on at least one surface thereof; a Bernoulli plate member positioned adjacent said disk surface having the magnetic recording material thereon; said plate member being concave in one direction and having a plurality of orifices therein through which air is drawn when said disk is rotating; said orifices being aligned radially outwardly from the center of said plate member, adjacent radial lines of said orifices being offset radially from each other, said plate member having a transducer opening therein for location of transducing means to magnetically cooperate with said disk in a non-contact transducing relationship.
Claim 3
Dependent Claim
27 words
Apparatus in accordance with claim 1, in which said transducing means is movable, said plate member being concave in the direction of movement of said transducing means.
Claim 4
Dependent Claim
46 words
Apparatus in accordance with claim 1, in which said transducing means is movable, basically parallel to the trough of the concavity, said concavity being normal to the movement of the transducing means, said plate member being concave in the direction of movement of said transducing means.
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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) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |