Patent US4634646A successfully refreshed from Google Patents.
US4634646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the formation of electrophotographic images
Assignee: Kyocera Mita Industrial Co Ltd
•
Filing: 1985-06-17
•
Granted: 1987-01-06
•
Expires: 2005-06-17
Abstract
Abstract A method for the formation of images comprising: (1) feeding a photoconductive toner, having a particle diameter of on the average 6 μm or less, to a conductive substrate to form a toner layer of 1 to 8 layers on said conductive substrate, (2) uniformly charging said toner layer, and (3) exposing said toner layer to form an electrostatic latent image thereon corresponding to the original.
Inventors
- 👤 Yumiko Sano
- 👤 Teruyo Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:04
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/09; G03G9/0926; G03G13/00; G03G13/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A method for the formation of images comprising: (1) uniformly inducing an electrostatic charge on a photoconductive toner, having an average particle diameter of 6 μm or less, by friction between the toner and at least one of a wall of a hopper containing said toner therein and a magnetic carrier, (2) applying a bias potential having a different polarity from the charging polarity of said toner to a conductive substrate, (3) feeding said charged toner to said charged conductive substrate to uniformly and intimately form a toner layer of 1 to 8 layers on said conductive substrate, while controlling the bias potential at a certain level depending upon the amount of electrostatic charges on said toner, (4) uniformly charging said toner layer, and (5) exposing said toner layer to form an electrostatic latent image thereon corresponding to an original.
Claim 2
Independent Claim
140 words
A method for the formation of images comprising: (1) uniformly inducing an electrostatic charge on a photoconductive toner, having an average particle diameter of 6 μm or less, by friction between the toner and at least one of a wall of a hopper containing said toner therein and a magnetic carrier, (2) applying a bias potential having a different polarity from the charging polarity of said toner to a conductive substrate, (3) feeding said charged toner to said charged conductive substrate to uniformly and intimately form a toner layer of 1 to 8 layers on said conductive substrate, while controlling the bias potential at a certain level depending upon the amount of electrostatic charges on said toner, (4) uniformly charging said toner layer, and (5) exposing said toner layer to form an electrostatic latent image thereon corresponding to an original.
Claim 3
Dependent Claim
26 words
A method for the formation of images according to claim 1, wherein said toner layer is of a multiple toner layer of 2 to 4 layers.
Claim 4
Dependent Claim
25 words
A method for the formation of images according to claim 1, wherein said photoconductive toner consists essentially of a charge-generating pigment and a resin binder.
Claim 5
Dependent Claim
18 words
A method for the formation of images according to claim 3, wherein said resin binder is styrene-acrylic resin.
Claim 6
Dependent Claim
19 words
A method for the formation of images according to claim 3, wherein said charge-generating pigment is a phthalocyanine pigment.
Claim 7
Dependent Claim
32 words
A method for the formation of images according to claim 1, wherein a bias potential having a different polarity from the charging polarity of said toner layer is applied to said substrate.
Claim 8
Dependent Claim
19 words
A method according to claim 1, wherein said 1 to 8 layers are respectively approximately one toner particle deep.
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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |