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US 4,536,428 AGranted
Magnetic display panel
AssigneePilot Man-Nen-Hitsu Kabushiki Kaisha
InventorsYasuzo Murata, Hiroshi Sato
Life of this patent
Estimating the term…
Abstract
A magnetic display panel having a transparent or translucent front substrate and a rear substrate bonded thereto by an adhesive with a dispersing liquid confining space formed between the substrates, preferably in the form of multiple cells. The dispersing liquid, composed of a fine particulate thickener, fine magnetic particles, a colorant and a dispersing medium, has a yield value of at least 5 dyne/cm.sup.2. A clear, long-lasting image is recordable by tracing a permanent magnet upon the face of the first substrate.
Claims35
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 comprising a polyester adhesive, a liquid sealing space being formed between said substrates;
- and
- a dispersing liquid having a yield value of at least 5 dyne/cm.sup.2 sealed in said space, said dispersing liquid comprising, a fine particulate thickener selected from the group consisting of an olefinic polymer, olefinic copolymer, metal soap, fatty acid amide, wax and dextrin fatty acid ester;
- fine magnetic particles, a colorant and a dispersion medium, an image being recordable on said panel by a movable marking device having an oriented magnetic field.
1 more element
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 liquid dispersion having a yield value of at least 5 dyne/cm.sup.2 disposed in said liquid sealing space, said dispersion comprising fine magnetic particles, a colorant, a dispersion medium and an organic thickener comprising an olefinic polymer, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field.
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 betweeen said substrates, said substrates being bonded together with an adhesive;
- and
- a liquid dispersion having a yield value of at least 5 dyne/cm.sup.2 disposed in said liquid sealing space, said dispersion comprising fine magnetic particles, a colorant, a dispersion medium and an organic thickener comprising a copolymer of an olefin and a monomer copolymerizable therewith, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field.
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 liquid dispersion having a yield value of at least 5 dyne/cm.sup.2 disposed in said liquid sealing space, said dispersion comprising fine magnetic particles, a colorant, a dispersion medium and an organic thickener comprising a fatty acid amide, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field.
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 liquid dispersion having a yield value of at least 5 dyne/cm.sup.2 disposed in said liquid sealing space, said dispersion comprising fine magnetic particles, a colorant, a dispersion medium and an organic thickener comprising wax, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field.
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 liquid dispersion having a yield value of at least 5 dyne/cm.sup.2 disposed in said liquid sealing space, said dispersion comprising fine magnetic particles, a colorant, a dispersion medium and an organic thickener comprising a dextrin fatty acid ester, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field.
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 comprising a polyester adhesive;
- and
- a liquid dispersion having a yield value of at least 5 dyne/cm.sup.2 disposed in said liquid sealing space, said dispersion comprising fine magnetic particles, a colorant, a dispersion medium and an organic thickener, display of an image recordable on said panel by a movable marking device having an oriented magnetic field.
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 comprising an acrylic resin adhesive;
- and
- a liquid dispersion having a yield value of at least 5 dyne/cm.sup.2 disposed in said liquid sealing space, said dispersion comprising fine magnetic particles, a colorant, a dispersion medium and an organic thickener, display of an image being recordable on said panel by a movable marking device having an oriented magnetic field.
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 comprising an acrylic resin adhesive, a liquid sealing space being formed between said substrates;
- and
- a dispersing liquid having a yield value of at least 5 dyne/cm.sup.2 sealed in said space, said dispersing liquid comprising, a fine particulate thickener selected from the group consisting of an olefinic polymer, olefinic copolymer, metal soap, fatty acid amide, wax and dextrin fatty acid ester;
- fine magnetic particles, a colorant and a dispersion medium, an image being recordable on said panel by a movable marking device having an oriented magnetic field.
1 more element
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 comprising a synthetic rubber adhesive, a liquid sealing space being formed between said substrates;
- and
- a dispersing liquid having a yield value of at least 5 dyne/cm.sup.2 sealed in said space, said dispersing liquid comprising, a fine particulate thickener selected from the group consisting of an olefinic polymer, olefinic copolymer, metal soap, fatty acid amide, wax and dextrin fatty acid ester;
- fine magnetic particles, a colorant and a dispersion medium, an image being recordable on said panel by a movable marking device having an oriented magnetic field.
1 more element
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 comprising a synthetic rubber adhesive;
- and
- a liquid dispersion having a yield value of at least 5 dyne/cm.sup.2 disposed in said liquid sealing space, said dispersion comprising fine magnetic particles, a colorant, a dispersion medium and an organic thickener, display of an image recordable on said panel by a movable marking device having an oriented magnetic field.
Dependencies are inferred from the claim text.