Patent US4141849A successfully refreshed from Google Patents.
US4141849A
Expired / Lapsed
US
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Developer for developing electrostatic latent images
Assignee: Canon Inc
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Filing: 1977-02-22
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Granted: 1979-02-27
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Expires: 1997-02-22
Abstract
Abstract Graphite fluoride is added to a developer for developing electrostatic latent images.
Inventors
- 👤 Tetsuo Hasegawa
- 👤 Hitoshi Touma
- 👤 Kunio Satomi
- 👤 Tatsuo Miyamae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:15
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09766
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
42 words
A developer for developing electrostatic latent images comprising toner particles and finely divided graphite fluoride, wherein the amount of graphite fluoride is 0.001-10% by weight based on the toner, and the degree of fluorination of the graphite fluoride is at least 50%.
Claim 2
Dependent Claim
42 words
A developer for developing electrostatic latent images comprising toner particles and finely divided graphite fluoride, wherein the amount of graphite fluoride is 0.001-10% by weight based on the toner, and the degree of fluorination of the graphite fluoride is at least 50%.
Claim 3
Dependent Claim
9 words
A developer according to claim 1, including a carrier.
Claim 4
Dependent Claim
19 words
A developer according to claim 1, in which the finely divided graphite fluoride is contained in the toner particles.
Claim 5
Dependent Claim
20 words
A developer according to claim 1, in which the finely divided graphite fluoride is in admixture with the toner particle.
Claim 6
Dependent Claim
18 words
A developer according to claim 1, in which the degree of fluorination of the graphite fluoride is 100%.
Claim 7
Dependent Claim
22 words
A developer according to claim 1, in which the amount of the graphite fluoride is 0.1-1% by weight based on the toner.
Claim 8
Dependent Claim
18 words
A developer according to claim 1, in which the finely divided graphite fluoride is 0.05-5 microns in size.
Claim 9
Dependent Claim
19 words
A developer according to claim 1, in which the toner particle is a dye or pigment in a resin.
Claim 10
Dependent Claim
19 words
A developer according to claim 2, in which the finely divided graphite fluoride is contained in the toner particle.
Claim 11
Dependent Claim
20 words
A developer according to claim 2, in which the finely divided graphite fluoride is in admixture with the toner particle.
Claim 12
Dependent Claim
22 words
A developer according to claim 2, in which the amount of the graphite fluoride is 0.1-1% by weight based on the toner.
Claim 13
Dependent Claim
18 words
A developer according to claim 2, in which the finely divided graphite fluoride is 0.05-5 microns in size.
Claim 14
Dependent Claim
45 words
A toner for developing electrostatic latent images which comprises a colorant selected from dye and pigment and graphite fluoride in a resin, wherein the amount of graphite fluoride is 0.001-10% by weight and the degree of fluorination of the graphite fluoride is at least 50%.
Claim 15
Dependent Claim
45 words
A toner for developing electrostatic latent images which comprises a colorant selected from dye and pigment and graphite fluoride in a resin, wherein the amount of graphite fluoride is 0.001-10% by weight and the degree of fluorination of the graphite fluoride is at least 50%.
Claim 16
Dependent Claim
16 words
A toner according to claim 13, wherein the amount of graphite fluoride is 0.1-1% by weight.
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) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |