Patent US4643684A successfully refreshed from Google Patents.
US4643684A
Expired / Lapsed
US
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Magnetic display panel
Assignee: Pilot Corp
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Filing: 1981-02-27
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Granted: 1987-02-17
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Expires: 2001-02-27
Abstract
Abstract A magnetic display panel in which syneresis is completely eliminated between a colorant and a dispersion medium by the simultaneous use of organic and inorganic thickener. A liquid sealing space is provided between two substrates sealed by an adhesive in which space a dispersing liquid having a yield value of at least 5 dyne/cm2 is filled. The dispersing liquid is composed of fine magnetic particles, a colorant, a dispersion medium and the organic and inorganic thickeners. The organic thickener is preferably one of olefinic polymer, olefinic copolymer, wax, metal soap and dextrin fatty acid ester while inorganic thickener is preferably one of fine powder silicic acid and fine powder silicate.
Inventors
- 👤 Yasuzo Murata
- 👤 Hiroshi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:44
CPC Classifications
B; B43; B43L; B43L1/00; B43L1/008; G; G02; G02F; G02F1/00; G02F1/01; G02F1/09; G02F1/091; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24157; Y10T428/24174
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
146 words
A magnetic display panel comprising: a liquid containing panel having a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate disposed opposite to said substrate and bonded thereto by an adhesive, a liquid sealing space being formed between said substrate; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 sealed in said space, said dispersing liquid comprising at least one organic thickener selected from the group consisting of olefinic polymer, olefinic copolymer, wax, metal soap and dextrin fatty acid ester, at least one inorganic thickener selected from the group consisting of fine powder silicic acid and fine powder silicate, fine magnetic particles having a low coercive force, a colorant and a dispersion medium, an image being recordable on said panel by a movable marking device having an oriented magnetic field.
Claim 2
Dependent Claim
146 words
A magnetic display panel comprising: a liquid containing panel having a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate disposed opposite to said substrate and bonded thereto by an adhesive, a liquid sealing space being formed between said substrate; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 sealed in said space, said dispersing liquid comprising at least one organic thickener selected from the group consisting of olefinic polymer, olefinic copolymer, wax, metal soap and dextrin fatty acid ester, at least one inorganic thickener selected from the group consisting of fine powder silicic acid and fine powder silicate, fine magnetic particles having a low coercive force, a colorant and a dispersion medium, an image being recordable on said panel by a movable marking device having an oriented magnetic field.
Claim 3
Dependent Claim
32 words
The magnetic display panel according to claim 1 further comprising a multicell structure having a plurality of independent spaces disposed between said substrates and being bonded to said substrates by an adhesive.
Claim 4
Dependent Claim
18 words
The magnetic display panel according to claim 2 wherein said multicell structure comprises a plurality of honeycomb cores.
Claim 5
Dependent Claim
43 words
The magnetic display panel according to claim 1 or 2 wherein said fine magnetic particles having a low retention force comprise a material selected from the group consisting of black magnetite, gamma-hematite, chromium dioxide, ferrite, iron, cobalt and nickel including granulated particles thereof.
Claim 6
Dependent Claim
29 words
The magnetic display panel according to claim 1 or 2 wherein the movable marking device having an oriented magnetic field comprises one of a permanent magnet and an electromagnet.
Claim 7
Dependent Claim
18 words
The magnetic display panel according to claim 1 or 2 wherein said adhesive comprises an epoxy resin adhesive.
Claim 8
Dependent Claim
17 words
The magnetic display panel according to claim 1 or 2 wherein said adhesive comprises a polyurethane adhesive.
Claim 9
Dependent Claim
17 words
The magnetic display panel according to claim 1 or 2 wherein said adhesive comprises a vinyl adhesive.
Claim 10
Dependent Claim
17 words
The magnetic display panel according to claim 1 or 2 wherein said adhesive comprises a polyester adhesive.
Claim 11
Dependent Claim
18 words
The magnetic display panel according to claim 1 or 2 wherein said adhesive comprises an acrylic resin adhesive.
Claim 12
Dependent Claim
18 words
The magnetic display panel according to claim 1 or 2 wherein said adhesive comprises a synthetic rubber adhesive.
Claim 13
Dependent Claim
120 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises an olefinic polymer.
Claim 14
Dependent Claim
120 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises an olefinic polymer.
Claim 15
Dependent Claim
126 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises a copolymer of an olefin and a monomer copolymerizable therewith.
Claim 16
Dependent Claim
126 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises a copolymer of an olefin and a monomer copolymerizable therewith.
Claim 17
Dependent Claim
118 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises wax.
Claim 18
Dependent Claim
118 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises wax.
Claim 19
Dependent Claim
119 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises metal soap.
Claim 20
Dependent Claim
119 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises metal soap.
Claim 21
Dependent Claim
122 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises a dextrin fatty acid ester.
Claim 22
Dependent Claim
122 words
A magnetic display panel comprising: a front substrate formed of a material selected from the group consisting of transparent and translucent materials and a rear substrate arranged opposite said front substrate, a liquid sealing space being formed between said substrates, said substrates being bonded together with an adhesive; and a dispersing liquid having a yield value of at least 5 dyne/cm 2 disposed in said liquid sealing space, said dispersing liquid comprising fine magnetic particles, a colorant, a dispersion medium and a thickener, said thickener comprising an inorganic thickener and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field, wherein said organic thickener comprises a dextrin fatty acid ester.
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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |