US4555467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer having improved flow characteristics and a process for producing same
Assignee: Canon Inc
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Filing: 1983-12-06
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Granted: 1985-11-26
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Expires: 2003-12-06
Abstract
Abstract A developer comprises toner particles and flowability improver granules having a granule size of 0.1-20 times the average particle size of the toner particles. The developer has high durability, fixability and good developing characteristics.
Inventors
- 👤 Tetsuo Hasegawa
- 👤 Koushi Suematsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:22
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09708; G03G9/09725; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/104
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
80 words
A one-component developer which comprises toner particles and flowability improver granules; said granules each comprising a plurality of primary flowability improver particles, said flowability improver granules having a granule size of 1-20 times the average particle size of the toner particles, and said primary flowability improver particles having an average particle size smaller than the average particle size of the toner particles; wherein said granules are capable of releasing said primary flowability improver particles over a continued period of use.
Claim 2
Dependent Claim
80 words
A one-component developer which comprises toner particles and flowability improver granules; said granules each comprising a plurality of primary flowability improver particles, said flowability improver granules having a granule size of 1-20 times the average particle size of the toner particles, and said primary flowability improver particles having an average particle size smaller than the average particle size of the toner particles; wherein said granules are capable of releasing said primary flowability improver particles over a continued period of use.
Claim 3
Dependent Claim
21 words
A one-component developer according to claim 1 wherein the average particle size of the primary flowability improver particles is 5-100 μm.
Claim 4
Dependent Claim
17 words
A one component developer according to claim 1 wherein the flowability improver is colloidal silica or alumina.
Claim 5
Dependent Claim
29 words
A one-component developer according to claim 1 wherein the amount of the flowability improver granules is 0.1-10 parts by weight per 100 parts by weight of the toner particles.
Claim 6
Dependent Claim
84 words
A one-component developer which comprises toner particles, primary flowability improver particles and flowability improver granules; said granules each comprising a plurality of primary flowability improver particles, said flowability improver granules having a granule size of 1-20 times the average particle size of the toner particles, and said primary flowability improver particles having an average particle size smaller than the average particle size of the toner particles; wherein said granules are capable of releasing said primary flowability improver particles over a continued period of use.
Claim 7
Dependent Claim
84 words
A one-component developer which comprises toner particles, primary flowability improver particles and flowability improver granules; said granules each comprising a plurality of primary flowability improver particles, said flowability improver granules having a granule size of 1-20 times the average particle size of the toner particles, and said primary flowability improver particles having an average particle size smaller than the average particle size of the toner particles; wherein said granules are capable of releasing said primary flowability improver particles over a continued period of use.
Claim 8
Dependent Claim
30 words
A one-component developer according to claim 5 wherein the amount of the primary flowability improver particles is 0.01-10 parts by weight per 100 parts by weight of the toner particles.
Claim 9
Dependent Claim
63 words
A process for producing a one-component developer which comprises mixing by means of a mixer without utilizing shearing force (a) flowability improver granules comprised of primary flowability improver particles for continued release of said primary particles in the developer and (b) toner particles; said primary flowability improver particles having an average particle size smaller than the average particle size of the toner particles.
Claim 10
Dependent Claim
63 words
A process for producing a one-component developer which comprises mixing by means of a mixer without utilizing shearing force (a) flowability improver granules comprised of primary flowability improver particles for continued release of said primary particles in the developer and (b) toner particles; said primary flowability improver particles having an average particle size smaller than the average particle size of the toner particles.
Claim 11
Dependent Claim
26 words
A process according to claim 7 wherein the flowability improver granules have an average granule size 1-20 times the average particle size of the toner particles.
Claim 12
Dependent Claim
103 words
A process for producing a developer which contains flowability improver granules for continued release of its primary flowability improver particles comprising the steps of: (a) mixing toner particles and primary particles of a flowability improver having an average particle size smaller than the average particle size of the toner particles by means of a mixer utilizing shearing force to form a mixture; and (b) mixing said mixture with flowability improver granules by means of a mixer without utilizing shearing force; said granules each comprising a plurality of primary flowability particles capable of being released in the developer over a continued period of use.
Claim 13
Dependent Claim
103 words
A process for producing a developer which contains flowability improver granules for continued release of its primary flowability improver particles comprising the steps of: (a) mixing toner particles and primary particles of a flowability improver having an average particle size smaller than the average particle size of the toner particles by means of a mixer utilizing shearing force to form a mixture; and (b) mixing said mixture with flowability improver granules by means of a mixer without utilizing shearing force; said granules each comprising a plurality of primary flowability particles capable of being released in the developer over a continued period of use.
Claim 14
Dependent Claim
37 words
A process according to claim 9 wherein in step (a) 100 parts by weight of toner particles and 0.01-10 parts by weight of primary flowability improver particles are mixed by means of a mixer utilizing shearing force.
Claim 15
Dependent Claim
29 words
A process according to claim 9 wherein in step (b) the flowability improver granules have an average granule size larger than the average particle size of the toner particles.
Claim 16
Dependent Claim
85 words
A process for producing a developer which contains flowability improver granules for continued release of its primary flowability improver particles comprising the steps of: (a) mixing toner particles and flowability improver granules by means of a mixer utilizing shearing force to form a mixture; and (b) mixing said mixture with flowability improver granules by means of a mixer without utilizing shearing force; said granules each comprising a plurality of primary flowability particles capable of being released in the developer over a continued period of use.
Claim 17
Dependent Claim
85 words
A process for producing a developer which contains flowability improver granules for continued release of its primary flowability improver particles comprising the steps of: (a) mixing toner particles and flowability improver granules by means of a mixer utilizing shearing force to form a mixture; and (b) mixing said mixture with flowability improver granules by means of a mixer without utilizing shearing force; said granules each comprising a plurality of primary flowability particles capable of being released in the developer over a continued period of use.
Claim 18
Dependent Claim
30 words
A process according to claim 12 wherein in step (a) the average granule size of the flowability improver granules is larger than the average particle size of the toner particles.
Claim 19
Dependent Claim
31 words
A process according to claim 12 or 13 wherein in step (b) the flowability improver granules have an average granule size larger than the average particle size of the toner particles.
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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |