Patent US4769733A successfully refreshed from Google Patents.
US4769733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wipers for pair of stabilized magnetic disks
Assignee: EMC Corp
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Filing: 1987-02-27
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Granted: 1988-09-06
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Expires: 2007-02-27
Abstract
Abstract A device and process for stabilizing two coaxially joined flexible magnetic disks is disclosed. Two or more flexible magnetic disks are coaxially joined by a coaxially located spacer. One of the disks is juxtaposed to and rotated against a flat stable Bernoulli surface. A second disk spaced by the spacer from the first disk contains centrally located perforations into which air can flow. According to certain embodiments, a flexible interdisk wiper is positioned between the disks and aids in stabilization thereof. In other embodiments, top and bottom disk wipers are also included.
Inventors
- 👤 Robert Freeman
- 👤 Richard Howe
- 👤 Brent Jenkins
- 👤 David Jones
- 👤 Merle Thowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:45
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/32; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B23/0335; G11B23/50; G11B23/505; G11B25/00; G11B25/04; G11B25/043; G11B5/00; G11B5/48; G11B5/488; G11B5/4886
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
79 words
A magnetic data storage cartridge of the type in which storage disks are rotated by a drive spindle in read/write relationship with two substantially opposed transducers comprising: two flexible storage disks; a spacer for coaxially joining said disks in precise spaced relation, said spacer being substantially coaxial of said disk and being of a smaller diameter than said disks; and a flexible inter-disk wiper secured to said cartridge and positioned between said disks to stabilize said disks during rotation.
Claim 2
Dependent Claim
79 words
A magnetic data storage cartridge of the type in which storage disks are rotated by a drive spindle in read/write relationship with two substantially opposed transducers comprising: two flexible storage disks; a spacer for coaxially joining said disks in precise spaced relation, said spacer being substantially coaxial of said disk and being of a smaller diameter than said disks; and a flexible inter-disk wiper secured to said cartridge and positioned between said disks to stabilize said disks during rotation.
Claim 3
Dependent Claim
34 words
The cartridge recited in claim 1 wherein said inter-disk wiper is half-moon shaped and is located in the rear half of said cartridge, in relation to the rotation of said disks past said transducers.
Claim 4
Dependent Claim
18 words
The cartridge recited in claim 1 wherein said inter-disk wiper is located at the rear of said cartridge.
Claim 5
Dependent Claim
35 words
The cartridge recited in claim 1 wherein said inter-disk wiper is of a thickness approximately equal to twice the spacing between said disks, and wherein said inter-disk wiper contacts the inner surfaces of said disks.
Claim 6
Dependent Claim
66 words
The cartridge recited in claim 1 wherein said two flexible disks comprise a generally planar bottom disk and a generally planar upper disk, said cartridge further comprising: a bottom disk wiper secured to said cartridge and in contact with the lower surface of said bottom disk and a top disk wiper secured to said cartridge and in contact with the upper surface of said top disk.
Claim 7
Dependent Claim
36 words
The cartridge recited in claim 5 wherein said bottom disk wiper has a quarter-moon shape and is located in the second quadrant of said cartridge in relation to the rotation of said disks past said transducers.
Claim 8
Dependent Claim
32 words
The cartridge recited in claim 5 wherein said top wiper is wedge-shaped and is located in the third quadrant of said cartridge relative to the rotation of said disks past said transducers.
Claim 9
Dependent Claim
21 words
The cartridge recited in claim 5 wherein said inter-disk, top and bottom, wipers are located at the rear of said cartridge.
Claim 10
Dependent Claim
16 words
The cartridge recited in claim 5 wherein said bottom wiper is a laminated flexible plastic wiper.
Claim 11
Dependent Claim
87 words
The cartridge recited in claim 9 further comprising: rigid side walls forming a container for said disks; one of said side walls having a rib on the inside surface thereof extending outwardly from the center of said cartridge; said bottom disk wiper being staked to said one side wall at two points near one edge of said wiper, said bottom wiper extending over said rib and into contact with said bottom disk whereby said wiper is biased against said bottom disk by the flexibility of said wiper.
Claim 12
Dependent Claim
23 words
The cartridge recited in claim 10 wherein said top wiper is attached by adhesive to the inner surface of the other side wall.
Claim 13
Dependent Claim
15 words
The cartridge recited in claim 1 wherein said flexible storage disks are magnetic storage disks.
Claim 14
Dependent Claim
20 words
The cartridge recited in claim 12 in combination with a magnetic data storage drive having two substantially opposed magnetic transducers.
Claim 15
Dependent Claim
37 words
The cartridge recited in claim 13 further comprising: a Bernoulli surface juxtaposed to a first of said disks so that said disk is stabilized by said Bernoulli surface when said disks are rotated by said drive spindle.
References Cited (Backward Citations)
US4214286A
Cited
SU594527A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |