US4404270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positively chargeable powdered electrophotographic toner containing dialkyl tin oxide charge control agent
Assignee: Resonac Corp
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Filing: 1981-05-21
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Granted: 1983-09-13
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Expires: 2001-05-21
Abstract
Abstract A toner comprising a resin, a colorant and a positive charge control agent selected from the group consisting of mica, monoalkyl and dialkyl tin oxides and urethane compounds, said charge control agent having high positive charging ability and good dispersibility in the resin, can be used for developing to give good quality images, having high density in the image areas and low background in the non-image areas.
Inventors
- 👤 Osamu Higashida
- 👤 Isamu Moribe
- 👤 Hajime Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:59
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09775; G03G9/09708; G03G9/09783; G03G9/09791
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
A toner which can be charged positively comprising (a) a resin, (b) a colorant, and (c) as a positive charge control agent, a compound selected from the group consisting of dialkyl tin oxides.
Claim 2
Dependent Claim
33 words
A toner which can be charged positively comprising (a) a resin, (b) a colorant, and (c) as a positive charge control agent, a compound selected from the group consisting of dialkyl tin oxides.
Claim 3
Dependent Claim
22 words
A toner according to claim 1, wherein the resin is one having a glass transition temperature of 40° C. to 150° C.
Claim 4
Dependent Claim
30 words
A toner according to claim 1, wherein the dialkyl tin oxide is used in an amount of 0.5 to 10% by weight based on the total weight of the toner.
Claim 5
Dependent Claim
15 words
A toner according to claim 1, wherein the dialkyl tin oxide is dibutyl tin oxide.
Claim 6
Dependent Claim
28 words
A toner according to claim 1, wherein said dialkyl tin oxides are selected from the group consisting of dibutyl tin oxide, dimethyl tin oxide and diethyl tin 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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |