US4935327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester toner with antioxidant for development of electrostatic latent image
Assignee: Konica Minolta Inc
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Filing: 1988-12-07
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Granted: 1990-06-19
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Expires: 2008-12-07
Abstract
Abstract A toner for developing an electrostatic image is disclosed, which is not likely cause fogs, toner flying, and solid-black non-uniformity when used for a large number of cpying cycles in a high temperature, high humidity. The toner comprises a polyester resin containing a trivalent or higher monomer as a polymerized component and an antioxidant. As the antioxidant, a compound having a hidered phenolic group is preferably used as the antioxidant.
Inventors
- 👤 Yoshio Takizawa
- 👤 Jiro Takahashi
- 👤 Akitoshi Matsubara
- 👤 Satoru Ikeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:56
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/087; G03G9/08742; G03G9/08755
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
49 words
A toner for developing an electrostatic latent image, which comprises a polyester resin comprising a trivalent or higher monomer as a polymerized component and an antioxidant having a hindered phenolic group, wherein said antioxidant is contained in said toner in an amount of from 0.01% to 5% by weight.
Claim 2
Dependent Claim
49 words
A toner for developing an electrostatic latent image, which comprises a polyester resin comprising a trivalent or higher monomer as a polymerized component and an antioxidant having a hindered phenolic group, wherein said antioxidant is contained in said toner in an amount of from 0.01% to 5% by weight.
Claim 3
Dependent Claim
18 words
The toner of claim 1, wherein said monomer is a polycarboxylic acid having at least three carboxyl groups.
Claim 4
Dependent Claim
13 words
The toner of claim 2, wherein said polycarboxylic acid is a benzenetricarboxylic acid.
Claim 5
Dependent Claim
34 words
The toner of claim 3, wherein said monomer is contained in said resin in a ratio of from 0.1 mol% to 80 mol% of the total amount of acidic monomer components in said resin.
Claim 6
Dependent Claim
34 words
The toner of claim 4, wherein said monomer is contained in said resin in a ratio of from 5 mol% to 50 mol% of the total amount of acidic monomer components in said resin.
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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |