US4985327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-magnetic toner
Assignee: Canon Inc
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Filing: 1990-05-22
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Granted: 1991-01-15
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Expires: 2010-05-22
Abstract
Abstract A developer for developing electrostatic images, comprising a non-magnetic toner, the toner containing 17-60% by number of non-magnetic toner particles of 5 microns or smaller, containing 1-30% by number of non-magnetic toner particles of 8-12.7 microns, and containing 2.0% by volume or less of nonmagnetic toner particles of 16 microns or larger; wherein the non-magnetic toner has a volume-average particle size of 4-10 microns, and the non-magnetic toner particles of 5 microns or smaller have a particle size distribution satisfying the following formula: N/V=-0.04N+k, wherein N denotes % by number of non-magnetic toner particles of 5 microns of smaller, V denotes % by volume of non-magnetic toner particles of 5 microns or smaller k denotes a positive number of 4.5-6.5, and N denotes a positive number of 17-60.
Inventors
- 👤 Kiichiro Sakashita
- 👤 Hirohide Tanikawa
- 👤 Satoshi Yoshida
- 👤 Toshiaki Nakahara
- 👤 Naoki Matsushige
- 👤 Masatsugu Fujiwara
- 👤 Yasuo Mitsuhashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:15
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0819; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
154 words
A developer for developing electrostatic images, comprising a non-magnetic toner, said toner containing 17-60% by number of non-magnetic toner particles having a particle size of 5 microns or smaller, containing 1-30% by number of non-magnetic toner particles having a particle size of 8-12.7 microns, and containing 2.0% by volume or less of non-magnetic toner particles having a particle size of 16 microns or larger; wherein the non-magnetic toner has a volume-average particle size of 4-10 microns, and the non-magnetic toner particles having a particle size of 5 microns or smaller have a particle size distribution satisfying the following formula: N/V=-0.04N+k, wherein N denotes the percentage by number of non-magnetic toner particles having a particle size of 5 micron or smaller, V denotes the percentage by volume of non-magnetic toner particles having a particle size of 5 microns or smaller, k denotes a positive number of 4.5-6.5, and N denotes a positive number of 17-60.
Claim 2
Dependent Claim
154 words
A developer for developing electrostatic images, comprising a non-magnetic toner, said toner containing 17-60% by number of non-magnetic toner particles having a particle size of 5 microns or smaller, containing 1-30% by number of non-magnetic toner particles having a particle size of 8-12.7 microns, and containing 2.0% by volume or less of non-magnetic toner particles having a particle size of 16 microns or larger; wherein the non-magnetic toner has a volume-average particle size of 4-10 microns, and the non-magnetic toner particles having a particle size of 5 microns or smaller have a particle size distribution satisfying the following formula: N/V=-0.04N+k, wherein N denotes the percentage by number of non-magnetic toner particles having a particle size of 5 micron or smaller, V denotes the percentage by volume of non-magnetic toner particles having a particle size of 5 microns or smaller, k denotes a positive number of 4.5-6.5, and N denotes a positive number of 17-60.
Claim 3
Dependent Claim
25 words
A developer according to claim 1, wherein the non-magnetic toner contains 1-23% by number of non-magnetic toner particles having a particle size of 8-12.7 microns.
Claim 4
Dependent Claim
27 words
A developer according to claim 1, wherein the non-magnetic toner contains 25-50% by number of non-magnetic toner particles having a particle size of 5 microns or smaller.
Claim 5
Dependent Claim
27 words
A developer according to claim 1, wherein the non-magnetic toner contains 30-50% by number of non-magnetic toner particles having a particle size of 5 microns or smaller.
Claim 6
Dependent Claim
25 words
A developer according to claim 1, wherein the non-magnetic toner contains 8-20% by number of non-magnetic toner particles having a particle size of 8-12.7 microns.
Claim 7
Dependent Claim
39 words
A developer according to claim 1, wherein the non-magnetic toner particles having a particle size of 5 microns or smaller satisfy the following formula: N/V=-0.04N+k, wherein k denotes a number of 4.5-6.0, and N denotes a number of 25-50.
Claim 8
Dependent Claim
39 words
A developer according to claim 1, wherein the non-magnetic toner particles having a particle size of 5 microns or smaller satisfy the following formula: N/V=-0.04N+k, wherein k denotes a number of 4.5-5.5, and N denotes a number of 30-50.
Claim 9
Dependent Claim
18 words
A developer according to claim 1, wherein the non-magnetic toner has a volume-average particle size of 4-8 microns.
Claim 10
Dependent Claim
17 words
A developer according to claim 1, wherein the non-magnetic toner has been mixed with silica fine powder.
Claim 11
Dependent Claim
26 words
A developer according to claim 9, wherein 0.01-8 wt. parts of the silica fine powder has been mixed with 100 wt. parts of the non-magnetic toner.
Claim 12
Dependent Claim
26 words
A developer according to claim 9, wherein 0.1-5 wt. parts of the silica fine powder has been mixed with 100 wt. parts of the non-magnetic toner.
Claim 13
Dependent Claim
21 words
A developer according to claim 9, wherein the non-magnetic toner has positive chargeability and the silica fine powder has positive chargeability.
Claim 14
Dependent Claim
21 words
A developer according to claim 9, wherein the non-magnetic toner has negative chargeability and the silica fine powder has negative chargeability.
Claim 15
Dependent Claim
20 words
A developer according to claim 1, wherein the non-magnetic toner has been mixed with fine powder of a fluorine-containing polymer.
Claim 16
Dependent Claim
30 words
A developer according to claim 14, wherein the powder of the fluorine-containing polymer is contained in an amount of 0.01-2.0 wt. % based on the weight of the non-magnetic toner.
Claim 17
Dependent Claim
31 words
A developer according to claim 14, wherein the fine powder of the fluorine-containing polymer is contained in an amount of 0.02-1.0 wt. % based on the weight of the non-magnetic toner.
Claim 18
Dependent Claim
24 words
A developer according to claim 1, wherein the non-magnetic toner has been mixed with silica fine powder and fine powder of a fluorine-containing polymer.
Claim 19
Dependent Claim
38 words
A developer according to claim 17, wherein 0.01-8 wt. parts of the silica fine powder and 0.01-2.0 wt. % of the fine powder of a fluorine-containing polymer have been mixed with 100 wt. parts of the non-magnetic toner.
Claim 20
Dependent Claim
16 words
A developer according to claim 1, wherein the non-magnetic toner has been mixed with a carrier.
Claim 21
Dependent Claim
24 words
A developer according to claim 19, wherein 10 wt. parts of the non-magnetic toner has been mixed with 10-1000 wt. parts of the carrier.
Claim 22
Dependent Claim
24 words
A developer according to claim 19, wherein 10 wt. parts of the non-magnetic toner has been mixed with 30-500 wt. parts of the carrier.
Claim 23
Dependent Claim
17 words
A developer according to claim 20, wherein the carrier has a volume-average particle size of 4-100 microns.
Claim 24
Dependent Claim
17 words
A developer according to claim 20, wherein the carrier has a volume-average particle size of 10-50 microns.
Claim 25
Dependent Claim
17 words
A developer according to claim 20, wherein the carrier has a volume-average particle size of 30-50 microns.
Claim 26
Dependent Claim
12 words
A developer according to claim 19, wherein the carrier comprises magnetic particles.
Claim 27
Dependent Claim
16 words
A developer according to claim 25, wherein the carrier comprises magnetic particles coated with a resin.
Claim 28
Dependent Claim
52 words
A developer according to claim 1, wherein the non-magnetic toner has a volume-average particle size of 4-9 microns, and wherein the non-magnetic toner particles having a particle size of 5 microns or smaller satisfy the following formula: N/V=-0.04N+K, where K denotes a number between 4.5-6.0, and N denotes a number between 25-50.
Claim 29
Dependent Claim
29 words
A developer according to claim 27, wherein the non-magnetic toner contains 0.5% by volume or less of non-magnetic toner particles having a particle size of 16 microns or larger.
Claim 30
Dependent Claim
18 words
A developer according to claim 28, wherein the non-magnetic toner contains a styrene copolymer as a binder resin.
Claim 31
Dependent Claim
18 words
A developer according to claim 28, wherein the non-magnetic toner contains a polyester resin as a binder resin.
Claim 32
Dependent Claim
54 words
A developer according to claim 1, wherein the non-magnetic toner has a volume-average particle size of 4-8 microns, and wherein the non-magnetic toner particles having a particle size of 5 microns or smaller satisfy the following formula: N/V - -0.04N+K, where K denotes a number between 4.5-6.00, and N denotes a number between 25-50.
Claim 33
Dependent Claim
29 words
A developer according to claim 31, wherein the non-magnetic toner contains 0.5% by volume or less of non-magnetic toner particles having a particle size of 16 microns or larger.
Claim 34
Dependent Claim
18 words
A developer according to claim 32, wherein the non-magnetic toner contains a styrene copolymer as a binder resin.
Claim 35
Dependent Claim
18 words
A developer according to claim 32, wherein the non-magnetic toner contains a polyester resin as a binder resin.
Claim 36
Dependent Claim
22 words
A developer according to claim 25, wherein the non-magnetic toner comprises a polyester resin, a colorant and a dialkylsalicylic acid chromium complex.
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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) | 1994-01-14 | 1994-07-16 | 1995-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-14 | 1998-07-16 | 1999-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-14 | 2002-07-16 | 2003-01-15 | $7700.00 | Window Closed / Lapsed |