US4284700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer coated transition metal powder as electrostatic image toner
Assignee: Toshiba Corp
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Filing: 1979-12-19
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Granted: 1981-08-18
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Expires: 1999-12-19
Abstract
Abstract A coated powder comprising a transition metal or compound thereof prepared by the process which comprises coating the surface of a powdered transition metal or compound there with a free radical polymerizable monomer having an e value of (-)0.8 to (+)0.8 and then subjecting the resulting coated powder to free-radical polymerization conditions.
Inventors
- 👤 Toshihiko Oguchi
- 👤 Akio Ishizawa
- 👤 Hiromi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:27
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08797; G03G9/083; G03G9/0839; G03G9/097; G03G9/09708; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
A toner powder capable of developing permanent visible images from latent electrostatic images comprising a thermoplastic resin and a coated powder comprising a transition metal or compound thereof which is coated with a polymer made from a free radical polymerizable monomer having an E value of (-)0.8 to (+)0.8 by in situ polymerization.
Claim 2
Dependent Claim
53 words
A toner powder capable of developing permanent visible images from latent electrostatic images comprising a thermoplastic resin and a coated powder comprising a transition metal or compound thereof which is coated with a polymer made from a free radical polymerizable monomer having an E value of (-)0.8 to (+)0.8 by in situ polymerization.
Claim 3
Dependent Claim
15 words
The toner powder of claim 1 in which the transition metal compound is molybdenum sulfide.
Claim 4
Dependent Claim
14 words
The toner powder of claim 1 in which the transition metal compound is magnetite.
Claim 5
Dependent Claim
15 words
The toner powder of claim 1 in which the e value is (-)0.4 to (+)0.6.
Claim 6
Dependent Claim
26 words
A toner powder capable of developing permanent visible images from latent electrostatic images wherein the coated powder of claim 1 is dispersed in the thermoplastic resin.
Claim 7
Dependent Claim
41 words
The toner powder of claim 1, wherein said free radical polymerizable monomer is selected from the group consisting of acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters, styrene, p-chlorostyrene, o-aminostyrene, acrylamide, acrylnitrile, vinyl pyridine, vinyl pyrrolidine and vinyl oxide.
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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |