Patent US3498287A successfully refreshed from Google Patents.
US4021358A
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US
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Toner for developing electrostatic latent images
Assignee: Konica Minolta Inc
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Filing: 1975-07-03
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Granted: 1977-05-03
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Expires: 1995-07-03
Abstract
Abstract A toner for developing electrostatic images which contains a particular addition condensate and a colorant wherein said addition condensate is present in an amount of from 1 to 100 parts by weight and said colorant in an amount of from 1 to 10 parts by weight of said toner.
Inventors
- 👤 Makoto Tomono
- 👤 Goiti Yamakawa
- 👤 Akira Inoue
- 👤 Masahiro Otsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:42
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/02; C08G73/0273; C08G73/026; G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08768
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
A toner for developing electrostatic latent images consisting essentially of an addition condensate having structural units represented by the following general formula: ##STR5## wherein R 1 and R 2 are hydrogen or lower alkyl, aryl, aralkyl or alkenyl, A is a group ##STR6## in which R 3 is the same as R 1 and R 2 , and B is a group ##STR7## in which R 4 is the same as R 1 and R 2 , and a colorant selected from the group consisting of a pigment, a dye, and a magnetic material, wherein said addition condensate is present in an amount of from 1 to 100 parts by weight and said colorant in an amount of from 1 to 10 parts by weight of said toner, said addition condensate, having an intrinsic visconsity measured at 25° C., of 0.03 to 0.20.
Claim 2
Dependent Claim
143 words
A toner for developing electrostatic latent images consisting essentially of an addition condensate having structural units represented by the following general formula: ##STR5## wherein R 1 and R 2 are hydrogen or lower alkyl, aryl, aralkyl or alkenyl, A is a group ##STR6## in which R 3 is the same as R 1 and R 2 , and B is a group ##STR7## in which R 4 is the same as R 1 and R 2 , and a colorant selected from the group consisting of a pigment, a dye, and a magnetic material, wherein said addition condensate is present in an amount of from 1 to 100 parts by weight and said colorant in an amount of from 1 to 10 parts by weight of said toner, said addition condensate, having an intrinsic visconsity measured at 25° C., of 0.03 to 0.20.
Claim 3
Dependent Claim
19 words
The toner of claim 1 wherein said colorant is one of black, cyan, magenta and yellow dyes or pigments.
Claim 4
Dependent Claim
31 words
The toner of claim 1, further comprising at least one resin selected from the group consisting of a vinyl resin, coumarone-indene resin, rosin-modified phenolic resin, oil-modified epoxy resin and polyether resin.
Claim 5
Dependent Claim
47 words
The toner of claim 3 wherein said addition condensate is present in an amount of 1 to 100 parts by weight, said resin in an amount of up to 100 parts by weight, and said colorant in an amount of 1-10 parts by weight, of said toner.
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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |