US4307169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microcapsular electroscopic marking particles
Assignee: Moore Business Forms Inc
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Filing: 1980-03-10
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Granted: 1981-12-22
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Expires: 2000-03-10
Abstract
Abstract Electroscopic marking particles comprising microcapsules consisting of a pressure fixable core and pressure rupturable shell which is characterized by the core comprising pressure fixable material and coloring matter and the shell is formed by interfacial polycondensation.
Inventors
- 👤 Josef Matkan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:28
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/093; G03G9/09392; G03G9/083; G03G9/0839; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
Electroscopic marking particles comprising microcapsules consisting of a pressure fixable core and pressure rupturable shell encapsulating the core, said shell being formed by interfacial polycondensation in an aqueous dispersion of reactants on and about the core of which at least one reactant is supported by the core during said polycondensation in the aqueous dispersion, and characterized by said core comprising a pressure fixable ink including magnetizable particles selected from the group consisting of magnetite and ferrite, and further characterized in that the magnetizable particles have surfaces treated to be oleophilic before exposure to any aqueous dispersion.
Claim 2
Dependent Claim
96 words
Electroscopic marking particles comprising microcapsules consisting of a pressure fixable core and pressure rupturable shell encapsulating the core, said shell being formed by interfacial polycondensation in an aqueous dispersion of reactants on and about the core of which at least one reactant is supported by the core during said polycondensation in the aqueous dispersion, and characterized by said core comprising a pressure fixable ink including magnetizable particles selected from the group consisting of magnetite and ferrite, and further characterized in that the magnetizable particles have surfaces treated to be oleophilic before exposure to any aqueous dispersion.
Claim 3
Dependent Claim
24 words
Electroscopic marking particles as set forth in claim 1, further characterized by pressure fixable material in said core including a binder and a pigment.
Claim 4
Dependent Claim
37 words
Electroscopic marking particles as set forth in claim 1, in which the oleophilic surface is presented by a material selected from the group consisting of an oleophilic silicone, an oil, a wax and an oleophilic resin .
Claim 5
Dependent Claim
31 words
Electroscopic marking particles as set forth in claim 1, further characterized by said shell comprising one interfacial polycondensation reaction product selected from the group consisting of polyamide, polyester and epoxy polymers.
Claim 6
Dependent Claim
47 words
Electroscopic marking particles as set forth in claim 1, further characterized by said shell containing externally a residue layer selected from the group consisting of ketone resin, surface active agent, sodium hydroxy ethyl cellulose, polyvinyl alcohol and a reaction product between polyvinyl alcohol and a melamine condensate.
Claim 7
Dependent Claim
27 words
Electroscopic marking particles as set forth in claim 1, admixed with a flow enhancer selected from the group consisting of calcium silicate, aluminum silicate and colloidal silica.
Claim 8
Dependent Claim
29 words
Pressure fixable two component toner comprising electroscopic marking particles as set forth in claim 1, admixed with carrier particles adapted to confer selected polarity onto said electroscopic marking particles.
Claim 9
Independent Claim
70 words
A method of preparing electroscopic marking particles comprising preparing an ink including magnetizable particles selected from the group consisting of magnetite and ferrite, encapsulating a discrete amount of the ink in a shell created thereabout by interfacial polycondensation of reactive components in an aqueous dispersion which form the shell, and treating the particles so the surfaces thereof are oleophilic prior to their being covered or encapsulated in the aqueous dispersion.
Claim 10
Independent Claim
70 words
A method of preparing electroscopic marking particles comprising preparing an ink including magnetizable particles selected from the group consisting of magnetite and ferrite, encapsulating a discrete amount of the ink in a shell created thereabout by interfacial polycondensation of reactive components in an aqueous dispersion which form the shell, and treating the particles so the surfaces thereof are oleophilic prior to their being covered or encapsulated in the aqueous dispersion.
Claim 11
Dependent Claim
16 words
A method according to claim 1 in which the ink contains a pigment and a binder.
Claim 12
Dependent Claim
27 words
A method according to claim 8 or 9 in which the oleophilic surface is selected from the group consisting of oleophilic silicone, oil, wax and oleophilic resin.
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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) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |