Patent US5538774A successfully refreshed from Google Patents.
US5538774A
Expired / Lapsed
US
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Internally damped rotatable storage article
Assignee: 3M Innovative Properties Co
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Filing: 1994-07-29
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Granted: 1996-07-23
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Expires: 2014-07-29
Abstract
Abstract The present invention provides a method for internally damping a rotatable storage article which is subject to resonant vibrations. More specifically, the present invention provides a method of improving the damping properties of a rotatable storage article by introducing a viscoelastic material as an inner layer(s) of the rotatable storage article. The invention also provides the damped rotatable storage articles themselves.
Inventors
- 👤 Donald T. Landin
- 👤 Jeffrey W. McCutcheon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:31
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/24018; G11B7/24024; F; F16; F16F; F16F3/00; F16F3/08; F16F3/087; F16F3/093; F16F1/00; F16F1/36; F16F1/3605; F16F15/00; F16F15/02; F16F15/04; F16F15/08; F16F9/00; F16F9/30; F16F9/306; G11B7/2403; F16F2224/00; F16F2224/04; F16F2224/048; F16F2228/00; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/21; Y10T428/25; Y10T428/252; Y10T428/254; Y10T428/256; Y10T428/257; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
80 words
An internally damped rotatable storage article having at least one layer of vibration damping material contained therein, comprising a viscoelastic material, said vibration damping material having a loss factor of at least about 0.01 and a storage modulus of at least about 6.9×10 3 Pascals, wherein the thickness of each of said layer(s) ranges from about 0.002 mm to about 0.5 mm, and wherein the vibration damping is improved by at least about 10% in at least 1 vibrational mode.
Claim 2
Dependent Claim
80 words
An internally damped rotatable storage article having at least one layer of vibration damping material contained therein, comprising a viscoelastic material, said vibration damping material having a loss factor of at least about 0.01 and a storage modulus of at least about 6.9×10 3 Pascals, wherein the thickness of each of said layer(s) ranges from about 0.002 mm to about 0.5 mm, and wherein the vibration damping is improved by at least about 10% in at least 1 vibrational mode.
Claim 3
Dependent Claim
24 words
The rotatable storage article of claim 1 wherein the thickness of each of said layer(s) ranges from about 0.02 mm to about 0.15 mm.
Claim 4
Dependent Claim
24 words
The rotatable storage article of claim 1 wherein the thickness of each of said layer(s) ranges from about 0.02 mm to about 0.05 mm.
Claim 5
Dependent Claim
30 words
The rotatable storage article of claim 1 wherein the thickness of each of said layer(s) of vibration damping material is about 0.5 to about 50% the thickness of the article.
Claim 6
Dependent Claim
31 words
The rotatable storage article of claim 1 wherein the thickness of each of said layer(s) of vibration damping material is about 1 to about 25% of the thickness of the article.
Claim 7
Dependent Claim
30 words
The rotatable storage article of claim 1 wherein the viscoelastic material has a loss factor greater than about 0.1 and a storage modulus of at least about 6.9×10 4 Pascals.
Claim 8
Dependent Claim
33 words
The rotatable storage article of claim 1 wherein the viscoelastic material has a loss factor of 0.5 to about 10 and a storage modulus of about 6.9×10 4 to about 1.4×10 7 Pascals.
Claim 9
Dependent Claim
25 words
The rotatable storage article of claim 1 wherein the viscoelastic material is selected from the group consisting of thermoplastic polymers, thermosetting polymers, and mixtures thereof.
Claim 10
Dependent Claim
15 words
The rotatable storage article of claim 1 wherein the viscoelastic material is a thermosetting polymer.
Claim 11
Dependent Claim
14 words
The rotatable storage article of claim 9 wherein the thermosetting polymer is an acrylate.
Claim 12
Dependent Claim
30 words
The rotatable storage article of claim 1 selected from the group consisting of magnetic rotatable storage articles, optical rotatable storage articles, magneto-optical rotatable storage articles, and mechanical rotatable storage articles.
Claim 13
Dependent Claim
39 words
The rotatable storage article of claim 1 selected from the group consisting of magnetic rigid disks, magnetic floppy disks, magnetic drums, optical compact disks, optical disks, optical drums, magneto- optical compact disks, magneto-optical disks, magneto-optical drums and vinyl records.
Claim 14
Dependent Claim
21 words
The rotatable storage article of claim 1 wherein said rotatable storage article contains at least 2 layers of vibration damping material.
Claim 15
Dependent Claim
17 words
The rotatable storage article of claim 1 wherein the vibration damping material further comprises a fibrous material.
Claim 16
Dependent Claim
32 words
The rotatable storage article of claim 14 wherein the vibration damping material includes about 3 to about 60 weight percent fibrous material, based on the total weight of the vibration damping material.
Claim 17
Dependent Claim
17 words
The rotatable storage article of claim 1 wherein the vibration damping material further comprises a particulate material.
Claim 18
Dependent Claim
40 words
The rotatable storage article of claim 16 wherein the particulate material is selected from the group consisting of glass bubbles, glass beads, ceramic bubbles, ceramic beads, thermally conductive bubbles, aluminum oxide powder, aluminum nitride powder, silica, and cured epoxy nodules.
Claim 19
Dependent Claim
33 words
The rotatable storage article of claim 1 wherein the vibration damping material includes about 0.5 to about 70 weight percent of particulate material based on the total weight of the vibration damping material.
Claim 20
Dependent Claim
21 words
The rotatable storage article of claim 1 wherein the vibration damping material further comprises a fibrous material and a particulate material.
Claim 21
Dependent Claim
47 words
The rotatable storage article of claim 1 which contains a single layer of vibration damping material wherein said layer is positioned within the article at a distance of at least about 5% of the thickness of the article from an upper and lower surface of the article.
Claim 22
Dependent Claim
47 words
The rotatable storage article of claim 1 which contains a single layer of vibration damping material wherein said layer is positioned within the article at a distance of at least about 30% of the thickness of the article from an upper and lower surface of the article.
Claim 23
Dependent Claim
34 words
The rotatable storage article of claim 1 wherein the rotatable storage article has one layer of damping material positioned equidistant from an upper surface of the article and a lower surface of the article.
Claim 24
Dependent Claim
74 words
The rotatable storage article of claim 1 which contains at least two layers of vibration damping material wherein each damping material layer is positioned within the article such that it is at least about 5% of the thickness of the article away from an upper and lower surface of the article and each vibration damping material layer is at least about 5% of the thickness of the article away from another vibration damping layer.
Claim 25
Dependent Claim
70 words
The rotatable storage article of claim 1 which contains at least two layers of vibration damping material wherein each damping material layer is positioned within the article such that it is at least about 5% of the thickness of the article away from an upper and lower surface of the article and each vibration damping material is at least about 20% of the article thickness away from another damping layer.
Claim 26
Dependent Claim
70 words
The rotatable storage article of claim 1 which contains at least two layers of vibration damping material wherein each damping material layer is positioned within the article such that it is at least about 5% of the thickness of the article away from an upper and lower surface of the article and each vibration damping material is at least about 30% of the article thickness away from another damping layer.
Claim 27
Dependent Claim
29 words
The rotatable storage article of claim 1 wherein the vibration damping material further comprises an epoxy resin material, wherein said epoxy resin material may optionally have vibration damping properties.
Claim 28
Dependent Claim
16 words
The rotatable storage article of claim 1 wherein the vibration damping layer is a continuous layer.
Claim 29
Dependent Claim
26 words
The rotatable storage article of claim 1 wherein the vibration damping layer is a continuous layer made up of adjacent sections of different vibration damping materials.
Claim 30
Dependent Claim
30 words
The rotatable storage article of claim 1 wherein the article contains at least 2 layers of vibration damping material, wherein at least 2 of the layers comprise different damping materials.
Claim 31
Dependent Claim
16 words
The rotatable storage article of claim 1 wherein the vibration damping layer is a discontinuous layer.
Claim 32
Dependent Claim
22 words
The rotatable storage article of claim 30 wherein the discontinuous layer comprises sections of damping material separated by non-damping material or spaces.
Claim 33
Dependent Claim
19 words
The rotatable storage article of claim 1 wherein each vibration damping material layer is encased within the storage article.
Claim 34
Independent Claim
96 words
A method of improving the viscoelastic damping characteristics of a rotatable storage article comprising providing at least one layer of vibration damping material within the rotatable storage article, each vibration damping material layer comprising a viscoelastic material, said vibration damping material having a loss factor of at least about 0.01 and a storage modulus of at least about 6.9×10 3 Pascals, wherein the thickness of each of said layer(s) ranges from about 0.002 mm to about 0.5 mm, and wherein the vibration damping is improved by at least about 10% in at least 1 vibrational mode.
Claim 35
Independent Claim
96 words
A method of improving the viscoelastic damping characteristics of a rotatable storage article comprising providing at least one layer of vibration damping material within the rotatable storage article, each vibration damping material layer comprising a viscoelastic material, said vibration damping material having a loss factor of at least about 0.01 and a storage modulus of at least about 6.9×10 3 Pascals, wherein the thickness of each of said layer(s) ranges from about 0.002 mm to about 0.5 mm, and wherein the vibration damping is improved by at least about 10% in at least 1 vibrational mode.
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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) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |