US4345013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual purpose magnetic toner
Assignee: Black Copy Co Inc
•
Filing: 1977-02-28
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Granted: 1982-08-17
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Expires: 1997-02-28
Abstract
Abstract A free-flowing, non-spherical, fragmentary, toner particle is prepared by blending a mixture of thermoplastic resins with magnetic iron oxide. The dispersion is processed to a fine powder and dry blended with conductive carbon black which is anchored onto the surface of the particle by warm air or gas.
Inventors
- 👤 Arthur S. Diamond
- 👤 Sydney N. Floersheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:28
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0825; G03G9/0802; G03G9/0808; G03G9/081; G03G9/0827; G03G9/087; G03G9/08742; G03G9/08755; G03G9/09; G03G9/0902; G03G9/0904; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
A, dual-purpose, single component, electronically-conductive, magnetically-attractable, toner composition consisting essentially of: fine, fragmentary, aspherical, acicular particles having a diameter from 10 to 40 microns and consisting essentially of an intimate dispersion of 50 to 150 parts per 100 parts by weight of resin blend of magnetic pigment, and 0 to 15 parts per 100 parts by weight of resin blend of conductive pigment in a homogenous blend of resin consisting of a linear polyester resin having a softening point from 95° C. to 115° C. and an ethylene-vinyl acetate copolymer resin containing 5 to 40% vinyl acetate and the ratio of polyester resin to copolymer resin is from 1:1 to 5:1; and 0.5 to 2.0% by weight of conductive pigment having a particle size of from 10 to 80 millimicrons attached to the surface of the particles.
Claim 2
Dependent Claim
137 words
A, dual-purpose, single component, electronically-conductive, magnetically-attractable, toner composition consisting essentially of: fine, fragmentary, aspherical, acicular particles having a diameter from 10 to 40 microns and consisting essentially of an intimate dispersion of 50 to 150 parts per 100 parts by weight of resin blend of magnetic pigment, and 0 to 15 parts per 100 parts by weight of resin blend of conductive pigment in a homogenous blend of resin consisting of a linear polyester resin having a softening point from 95° C. to 115° C. and an ethylene-vinyl acetate copolymer resin containing 5 to 40% vinyl acetate and the ratio of polyester resin to copolymer resin is from 1:1 to 5:1; and 0.5 to 2.0% by weight of conductive pigment having a particle size of from 10 to 80 millimicrons attached to the surface of the particles.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 in which the conductive pigment attached to the surface is carbon black.
Claim 4
Dependent Claim
21 words
A composition according to claim 2 in which the ratio of polyester resin to copolymer resin is from 2:1 to 4:1.
Claim 5
Dependent Claim
13 words
A composition according to claim 3 in which the magnetic pigment is magnetite.
Claim 6
Dependent Claim
17 words
A composition according to claim 1 in which the particle diameter is from 8 to 20 microns.
Claim 7
Dependent Claim
63 words
A composition according to claim 1 in which the polyester is the condensation product of a dibasic acid selected from the group consisting of fumaric acid, maleic acid, itaconic acid, phthalic acid, adipic acid or sebacic acid with a diol selected from the group consisting of ethylene glycol, propylene glycol, neopentyl glycol, Bisphenol-A, hydrogenated Bisphenol-A, and ethoxylated and propoxylated derivatives of Bisphenol A.
Claim 8
Dependent Claim
25 words
A composition according to claim 1 in which the linear polyester is a condensation product of an aromatic diol and an unsaturated aliphatic dibasic acid.
Claim 9
Dependent Claim
19 words
A composition according to claim 7 in which the diol is a bisphenol and the acid is fumaric acid.
Claim 10
Dependent Claim
17 words
A composition according to claim 8 in which the polyester is a propoxylated Bisphenol-A fumarate polyester resin.
Claim 11
Dependent Claim
19 words
A composition according to claim 9 in which the ratio of polyester resin to copolymer resin is about 2.5/l.
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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) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |