US5098776A
Expired / Lapsed
US
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Shape memory fibrous sheet and method of imparting shape memory property to fibrous sheet product
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1989-10-25
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Granted: 1992-03-24
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Expires: 2009-10-25
Abstract
Abstract A fibrous sheet having the shape memory property which comprises a sheet made of natural fiber and/or synthetic fiber and a layer formed by applying a powder of shape memory polymer; and a method of imparting the shape memory property which comprises applying a powder of shape memory polymer to a desired part of a product of a sheet made of natural fiber and/or synthetic fiber by the aid of a resin adhesive.
Inventors
- 👤 Kazuyuki Kobayashi
- 👤 Shunichi Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:10
CPC Classifications
D; D03; D03D; D03D15/00; D06; D06M; D06M15/00; D06M15/693; B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/0658; D06M15/19; D06M15/37; D06M15/564; D06M23/00; D06M23/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/31551; Y10T442/00; Y10T442/20; Y10T442/2369
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A fibrous sheet having a shaped memory property which comprises a sheet made of natural fiber and/or synthetic fiber and a shaped memory polymer layer formed by a powder of shape memory polymer applied to the sheet fiber, the polymer undergoing large changes in its modulus of longitudinal elasticity around its glass transition point temperature, the polymer restoring the fibrous sheet to its original shape when heated to a temperature higher than the glass transition point temperature.
Claim 2
Dependent Claim
77 words
A fibrous sheet having a shaped memory property which comprises a sheet made of natural fiber and/or synthetic fiber and a shaped memory polymer layer formed by a powder of shape memory polymer applied to the sheet fiber, the polymer undergoing large changes in its modulus of longitudinal elasticity around its glass transition point temperature, the polymer restoring the fibrous sheet to its original shape when heated to a temperature higher than the glass transition point temperature.
Claim 3
Dependent Claim
27 words
A fibrous sheet as claimed in claim 1, wherein the powder of shape memory polymer has a particle diameter larger than the diameter of the fiber used.
Claim 4
Dependent Claim
32 words
A fibrous sheet as claimed in claim 1, wherein the powder of shape memory polymer is used in an amount of 10-95wt % of the sheet of natural fiber and/or synthetic fiber.
Claim 5
Independent Claim
77 words
A method of imparting a shaped memory property to a sheet product which comprises applying a powder of shape memory polymer to a desired part of a sheet product made of natural fiber and/or synthetic fiber, the shaped memory polymer undergoing changes in its modulus of longitudinal elasticity around its glass transition point temperature, the applied polymer restoring the sheet product to its original shape when heated to a temperature higher than the glass transition point temperature.
Claim 6
Independent Claim
77 words
A method of imparting a shaped memory property to a sheet product which comprises applying a powder of shape memory polymer to a desired part of a sheet product made of natural fiber and/or synthetic fiber, the shaped memory polymer undergoing changes in its modulus of longitudinal elasticity around its glass transition point temperature, the applied polymer restoring the sheet product to its original shape when heated to a temperature higher than the glass transition point temperature.
Claim 7
Dependent Claim
32 words
A method of imparting the shape memory property as claimed in claim 4, wherein the powder of shape memory polymer has a particle diameter larger than the diameter of the fiber used.
Claim 8
Dependent Claim
38 words
A method of imparting the shape memory property as claimed in claim 4, wherein the powder of shape memory polymer is used in an amount of 10-95 wt % of the sheet of natural fiber and/or synthetic fiber.
Claim 9
Dependent Claim
53 words
A method of imparting the shape memory property as claimed in claim 4, wherein the powder of shape memory polymer is one which is produced by cooling the shape memory polymer in pellet form to an extremely low temperature by the aid of liquefied gas and then pulverizing with an external mechanical force.
Claim 10
Dependent Claim
25 words
A method of imparting the shape memory property as claimed in claim 4 further comprising mixing a resin adhesive with the shape memory polymer powder.
Claim 11
Dependent Claim
28 words
A method of imparting the shape memory property as claimed in claim 8, wherein the resin adhesive is highly viscous and prepared by dissolving polyurethane in a solvent.
Claim 12
Dependent Claim
39 words
A method of imparting the shape memory property as claimed in claim 8, wherein the resin adhesive is used in an amount of 30-70 parts by volume for 100 parts by volume of the powder of shape memory polymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |