US4812381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatographic toners and developers containing new charge-control agents
Assignee: Eastman Kodak Co
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Filing: 1987-12-17
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Granted: 1989-03-14
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Expires: 2007-12-17
Abstract
Abstract New electrostatographic toners and developers are provided containing new charge-control agents comprising quaternary ammonium salts having the structure ##STR1## wherein R is alkyl having 12 to 18 carbon atoms.
Inventors
- 👤 Douglas E. Bugner
- 👤 Peter S. Alexandrovich
- 👤 Lawrence P. DeMejo
- 👤 Robert A. Guistina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:15
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09741; G03G9/09766
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
33 words
A dry, particulate, electrostatohgraphic toner composition comprising a polymeric binder and a charge-control agent comprising a quaternary ammonium salt having the structure ##STR3## wherein R is alkyl having 12 to 18 carbon atoms.
Claim 2
Dependent Claim
33 words
A dry, particulate, electrostatohgraphic toner composition comprising a polymeric binder and a charge-control agent comprising a quaternary ammonium salt having the structure ##STR3## wherein R is alkyl having 12 to 18 carbon atoms.
Claim 3
Dependent Claim
16 words
The toner composition of claim 1, wherein R is CH 3 (CH 2 ) 17 .
Claim 4
Dependent Claim
16 words
An electrostatographic developer comprising: a. the particulate toner composition of claim 1 and b. carrier particles.
Claim 5
Dependent Claim
17 words
The developer of claim 3, wherein the carrier particles comprise core material coated with a fluorohydrocarbon polymer.
References Cited (Backward Citations)
US3842019A
Cited
US3893935A
Cited
US4323634A
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US4139483A
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JPS548533A
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US4394430A
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US4490455A
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JPS61147260A
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US4684596A
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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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |