US4533232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic process
Assignee: Canon Inc
•
Filing: 1983-03-10
•
Granted: 1985-08-06
•
Expires: 2003-03-10
Abstract
Abstract An electrophotographic process comprising the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming an image on the charged electrophotographic photosensitive member by exposing the charged photosensitive member to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in the charge transport layer; and (c) developing the image with a developer.
Inventors
- 👤 Naoto Fujimura
- 👤 Akihiro Sonobe
- 👤 Toshiyuki Yoshihara
- 👤 Norie Takebayashi
- 👤 Takashi Tanaka
- 👤 Masaki Kuribayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:22
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22
Claims Analysis
Total Claims: 58
Claim 1
Independent Claim
108 words
An electrophotographic copying machine comprising: (1) an electrophotographic photosensitive member having a conductive substrate and a photosensitive layer including a charge generation layer and a charge transport layer; (2) means for charging said electrophotographic photosensitive member; (3) means for forming a latent image on said electrophotographic photosensitive member by exposing said electrophotographic photosensitive member to light, said latent image forming means including a light source and at least one of an ultraviolet-absorbing filter and a yellow filter disposed in the optical path between said electrophotographic photosensitive member and said light source; and (4) means for developing the latent image formed on said electrophotographic photosensitive member with a developer.
Claim 2
Dependent Claim
108 words
An electrophotographic copying machine comprising: (1) an electrophotographic photosensitive member having a conductive substrate and a photosensitive layer including a charge generation layer and a charge transport layer; (2) means for charging said electrophotographic photosensitive member; (3) means for forming a latent image on said electrophotographic photosensitive member by exposing said electrophotographic photosensitive member to light, said latent image forming means including a light source and at least one of an ultraviolet-absorbing filter and a yellow filter disposed in the optical path between said electrophotographic photosensitive member and said light source; and (4) means for developing the latent image formed on said electrophotographic photosensitive member with a developer.
Claim 3
Dependent Claim
27 words
An electrophotographic copying machine according to claim 1, wherein said light source is at least one of a halogen lamp, a xenon lamp, and a tungsten lamp.
Claim 4
Dependent Claim
32 words
An electrophotographic copying machine according to claim 1, further comprising a convergent optical transmission array, in addition to said filter, in the optical path between said light source and said photosensitive member.
Claim 5
Dependent Claim
20 words
An electrophotographic copying machine according to claim 1, wherein said charge transport layer comprises a charge-transporting material and a binder.
Claim 6
Dependent Claim
25 words
An electrophotographic copying machine according to claim 4, wherein said charge-transporting material is at least one of an electron attractive substance and a hole-transporting substance.
Claim 7
Dependent Claim
39 words
An electrophotographic copying machine according to claim 5, wherein said charge-transporting material is at least one compound selected from the group consisting of chloranil, bromanil, tetracyanoethylene, tetracyanoquinodimethane, 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2,4,7-trinitro-9 dicyanomethylenefluorenone, 2,4,5,7-tetranitroxanthone, and 2,4,8-trinitrothioxanthone, and polymers of these compounds.
Claim 8
Dependent Claim
42 words
An electrophotographic copying machine according to claim 5, wherein said charge-transporting material is at least one compound selected from the group consisting of carbazoles, hydrazones, pyrazolines, oxazole compounds, thiazole compounds, triarylmethane compounds, polyarylalkanes, polyvinylcarbazoles, polyvinylpyrenes, polyvinylanthracenes, polyvinylacridines, pyreneformaldehyde resin, and ethylcarbazole-formaldehyde resin.
Claim 9
Dependent Claim
15 words
An electrophotographic copying machine according to claim 7, wherein said charge-transporting material is a hydrazone.
Claim 10
Dependent Claim
15 words
An electrophotographic copying machine according to claim 7, wherein said charge-transporting material is a pyrazoline.
Claim 11
Dependent Claim
19 words
An electrophotographic copying machine according to claim 1, wherein said charge transport layer is 5 to 30μ in thickness.
Claim 12
Dependent Claim
34 words
An electrophotographic copying machine according to claim 1, wherein said charge transport layer of the electrophotographic photosensitive member contains a charge-transporting material and wherein said ultraviolet filter contains the same compound as said material.
Claim 13
Dependent Claim
34 words
An electrophotographic copying machine according to claim 1, wherein said charge transport layer of the electrophotographic photosensitive member contains a charge-transporting material and wherein said yellow filter contains the same compound as said material.
Claim 14
Dependent Claim
38 words
An electrophotographic copying machine according to claim 1, wherein said ultraviolet-absorbing filter contains at least one compound selected from the group consisting of chloranil, bromanil, tetracyanoethylene, tetracyanoquinodimethane, 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2,4,7-trinitro-9-dicyanomethylenefluorenone, 2,4,5,7-tetranitroxanthone, and 2,4,8-trinitrothioxanthone, and polymers of these compounds.
Claim 15
Dependent Claim
42 words
An electrophotographic copying machine according to claim 1, wherein said ultraviolet-absorbing filter contains at least one compound selected from the group consisting of carbazoles, hydrazones, pyrazolines, oxazole compounds, thiazole compounds, triarylmethane compounds, polyarylalkanes, polyvinylcarbazoles, polyvinylpyrenes, polyvinylanthracenes, polyvinylacridines, pyreneformaldehyde resin, and ethylcarbazole-formaldehyde resin.
Claim 16
Dependent Claim
38 words
An electrophotographic copying machine according to claim 1, wherein said yellow filter contains at least one compound selected from the group consisting of chloranil, bromanil, tetracyanoethylene, tetracyanoquinodimethane, 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2,4,7-trinitro-9-dicyanomethylenefluorenone, 2,4,5,7-tetranitroxanthone, and 2,4,8-trinitrothioxanthone, and polymers of these compounds.
Claim 17
Dependent Claim
42 words
An electrophotographic copying machine according to claim 1, wherein said yellow filter contains at least one compound selected from the group consisting of carbazoles, hydrazones, pyrazolines, oxazole compounds, thiazole compounds, triarylmethane compounds, polyarylalkanes, polyvinylcarbazoles, polyvinylpyrenes, polyvinylanthracenes, polyvinylacridines, pyrene-formaldehyde resin, and ethylcarbazole-formaldehyde resin.
Claim 18
Dependent Claim
173 words
An electrophotographic copying machine comprising: (1) an electrophotographic photosensitive member having a conductive substrate and a photosensitive layer including a charge generation layer and a charge transport layer; (2) means for charging said electrophotographic photosensitive member; (3) means for forming a latent image on said electrophotographic photosensitive member by exposing said electrophotographic photosensitive member to light, said latent image forming means including a first light source and at least one of an ultraviolet-absorbing filter and a yellow filter disposed in the optical path between said electrophotographic photosensitive member and said first light source; (4) means for developing the latent image formed on said electrophotographic photosensitive member with a developer; (5) means for transferring the developed image into a recording medium; and (6) means for eliminating charge on said photosensitive member after said transfer by said transferring means, said means for eliminating charge comprising a second light source and at least one of an ultraviolet-absorbing filter and a yellow filter disposed in the optical path between said second light source and said photosensitive member.
Claim 19
Dependent Claim
173 words
An electrophotographic copying machine comprising: (1) an electrophotographic photosensitive member having a conductive substrate and a photosensitive layer including a charge generation layer and a charge transport layer; (2) means for charging said electrophotographic photosensitive member; (3) means for forming a latent image on said electrophotographic photosensitive member by exposing said electrophotographic photosensitive member to light, said latent image forming means including a first light source and at least one of an ultraviolet-absorbing filter and a yellow filter disposed in the optical path between said electrophotographic photosensitive member and said first light source; (4) means for developing the latent image formed on said electrophotographic photosensitive member with a developer; (5) means for transferring the developed image into a recording medium; and (6) means for eliminating charge on said photosensitive member after said transfer by said transferring means, said means for eliminating charge comprising a second light source and at least one of an ultraviolet-absorbing filter and a yellow filter disposed in the optical path between said second light source and said photosensitive member.
Claim 20
Dependent Claim
134 words
An electrophotographic copying machine comprising: (1) an electrophotographic photosensitive member having a conductive substrate and a photosensitive layer including a charge generation layer and a charge transport layer; (2) means for charging said electrophotographic photosensitive member; (3) means for forming a latent image on said electrophotographic photosensitive member, said image forming means comprising a laser beam; (4) means for developing the latent image formed on said electrophotographic photosensitive member with a developer; (5) means for transferring the developed image onto a recording medium; and (6) means for eliminating charge on said photosensitive member after said transfer by said transferring means, said means for eliminating charge comprising a light source and at least one of an ultraviolet-absorbing filter and a yellow filter disposed in the optical path between said light source and said photosensitive member.
Claim 21
Dependent Claim
134 words
An electrophotographic copying machine comprising: (1) an electrophotographic photosensitive member having a conductive substrate and a photosensitive layer including a charge generation layer and a charge transport layer; (2) means for charging said electrophotographic photosensitive member; (3) means for forming a latent image on said electrophotographic photosensitive member, said image forming means comprising a laser beam; (4) means for developing the latent image formed on said electrophotographic photosensitive member with a developer; (5) means for transferring the developed image onto a recording medium; and (6) means for eliminating charge on said photosensitive member after said transfer by said transferring means, said means for eliminating charge comprising a light source and at least one of an ultraviolet-absorbing filter and a yellow filter disposed in the optical path between said light source and said photosensitive member.
Claim 22
Dependent Claim
91 words
An electrophotographic process comprising the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer; and (c) developing the latent image formed on the electrophotographic photosensitive member with a developer.
Claim 23
Dependent Claim
91 words
An electrophotographic process comprising the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer; and (c) developing the latent image formed on the electrophotographic photosensitive member with a developer.
Claim 24
Dependent Claim
34 words
An electrophotographic process according to claim 19, wherein the rays having the wavelength band which can be absorbed by said charge-transporting material are at least one of ultraviolet rays and rays of blue light.
Claim 25
Dependent Claim
43 words
An electrophotographic process according to claim 19, wherein the charged electrophotographic photosensitive member is exposed to the light of at least one of a halogen lamp, a xenon lamp, and a tungsten lamp passed through an ultraviolet-absorbing filter to cut off ultraviolet rays.
Claim 26
Dependent Claim
42 words
An electrophotographic process according to claim 19, wherein the charged electrophotographic photosensitive member is exposed to the light of at least one of a halogen lamp, a xenon lamp, and a tungsten lamp passed through a yellow filter to cut off light.
Claim 27
Dependent Claim
24 words
An electrophotographic process according to claim 19, wherein said charge-transporting material is at least one of an electron attractive substance and a hole-transporting substance.
Claim 28
Dependent Claim
37 words
An electrophotographic process according to claim 19, wherein said charge-transporting material is at least one compound selected from the group consisting of chloranil, bromanil, tetracyanoethylene, tetracyanoquinodimethane, 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2,4,7-trinitro-9-dicyanomethylenefluorenone, 2,4,5,7-tetranitroxanthone, and 2,4,8-trinitrothioxanthone, and polymers of these compounds.
Claim 29
Dependent Claim
41 words
An electrophotographic process according to claim 19, wherein said charge-transporting material is at least one compound selected from the group consisting of carbazoles, hydrazones, pyrazolines, oxazole compounds, thiazole compounds, triarylmethane compounds, polyarylalkanes, polyvinylcarbazoles, polyvinylpyrenes, polyvinylanthracenes, polyvinylacridines, pyrene-formaldehyde resin, and ethylcarbazole-formaldehyde resin.
Claim 30
Dependent Claim
14 words
An electrophotographic process according to claim 25, wherein said charge-transporting material is a hydrazone.
Claim 31
Dependent Claim
14 words
An electrophotographic process according to claim 25, wherein said charge-transporting material is a pyrazoline.
Claim 32
Dependent Claim
18 words
An electrophotographic process according to claim 19, wherein said charge transport layer is 5 to 30μ in thickness.
Claim 33
Dependent Claim
18 words
An electrophotographic process according to claim 19, wherein the charged electrophotographic photosensitive member is exposed to a laser-beam.
Claim 34
Dependent Claim
96 words
An electrophotographic process comprising at least two repetitions of the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer; and (c) developing the latent image formed on the electrophotographic photosensitive member with a developer.
Claim 35
Dependent Claim
96 words
An electrophotographic process comprising at least two repetitions of the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer; and (c) developing the latent image formed on the electrophotographic photosensitive member with a developer.
Claim 36
Dependent Claim
34 words
An electrophotographic process according to claim 30, wherein the rays having the wavelength band which can be absorbed by said charge-transporting material are at least one of ultraviolet rays and rays of blue light.
Claim 37
Dependent Claim
43 words
An electrophotographic process according to claim 30, wherein the charged electrophotographic photosensitive member is exposed to the light of at least one of a halogen lamp, a xenon lamp, and a tungsten lamp passed through an ultraviolet-absorbing filter to cut off ultraviolet rays.
Claim 38
Dependent Claim
42 words
An electrophotographic process according to claim 30, wherein the charged photosensitive member is exposed to the light of at least one of a halogen lamp, a xenon lamp, and a tungsten lamp passed through a yellow filter to cut off blue light.
Claim 39
Dependent Claim
24 words
An electrophotographic process according to claim 30, wherein said charge-transporting material is at least one of an electron attactive substance and a hole-transporting substance.
Claim 40
Dependent Claim
37 words
An electrophotographic process according to claim 30, wherein said charge-transporting material is at least one compound selected from the group consisting of chloranil, bromanil, tetracyanoethylene, tetracyanoquinodimethane, 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitro-9-fluorenone, 2,4,7-trinitro-9-dicyanomethylenefluorenone, 2,4,5,7-tetranitroxanthone, and 2,4,8-trinitrothioxanthone, and polymers of these compounds.
Claim 41
Dependent Claim
41 words
An electrophotographic process according to claim 30, wherein said charge-transporting material is at least one compound selected from the group consisting of carbazoles, hydrazones, pyrazolines, oxazole compounds, thiazole compounds, triarylmethane compounds, polyarylalkanes, polyvinylcarbazoles, polyvinylpyrenes, polyvinylanthracenes, polyvinylacridines, pyrene-formaldhyde resin, and ethylcarbazole-formaldehyde resin.
Claim 42
Dependent Claim
14 words
An electrophotographic process according to claim 30, wherein said charge-transporting material is a hydrazone.
Claim 43
Dependent Claim
14 words
An electrophotographic process according to claim 30, wherein said charge-transporting material is a pyrazoline.
Claim 44
Dependent Claim
18 words
An electrophotographic process according to claim 30, wherein said charge transport layer is 5 to 30μ in thickness.
Claim 45
Dependent Claim
18 words
An electrophotographic process according to claim 30, wherein the charged electrophotographic photosensitive member is exposed to a laser-beam.
Claim 46
Dependent Claim
136 words
An electrophotographic process comprising the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) a transferring the developed image onto a recording medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having wavelength band which can be absorbed by said charge-transporting material contained in said charge transport layer.
Claim 47
Dependent Claim
136 words
An electrophotographic process comprising the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) a transferring the developed image onto a recording medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having wavelength band which can be absorbed by said charge-transporting material contained in said charge transport layer.
Claim 48
Dependent Claim
115 words
An electrophotographic process comprising the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to a laser-beam; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which can be absorbed by said charge-transporting material contained in said charge transport layer.
Claim 49
Dependent Claim
115 words
An electrophotographic process comprising the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to a laser-beam; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which can be absorbed by said charge-transporting material contained in said charge transport layer.
Claim 50
Dependent Claim
26 words
An electrophotographic process according to claim 42, wherein said laser beam is at least one of a helium-cadmium laser, an argon laser, and a semiconductor laser.
Claim 51
Dependent Claim
141 words
An electrophotographic process comprising at least two repetitions of the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which can be absorbed by said charge-transporting material contained in said charge transport layer.
Claim 52
Dependent Claim
141 words
An electrophotographic process comprising at least two repetitions of the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which can be absorbed by said charge-transporting material contained in said charge transport layer.
Claim 53
Dependent Claim
120 words
An electrophotographic process comprising at least two repetitions of the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to a laser-beam; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording medium, and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which can be absorbed by said charge-transporting material contained in said charge transport layer.
Claim 54
Dependent Claim
120 words
An electrophotographic process comprising at least two repetitions of the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to a laser-beam; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording medium, and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which can be absorbed by said charge-transporting material contained in said charge transport layer.
Claim 55
Dependent Claim
114 words
An electrophotographic process comprising the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer.
Claim 56
Dependent Claim
114 words
An electrophotographic process comprising the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which can be absorbed by the charge-transporting material contained in said charge transport layer.
Claim 57
Dependent Claim
120 words
An electrophotographic process comprising at least two repetitions of the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording paper medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which may be absorbed by the charge-transporting material contained in said charge transport layer.
Claim 58
Dependent Claim
120 words
An electrophotographic process comprising at least two repetitions of the steps of: (a) charging an electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer which includes a charge generation layer and a charge transport layer containing a charge-transporting material; (b) forming a latent image on the electrophotographic photosensitive member by exposing the electrophotographic photosensitive member to light; (c) developing the latent image formed on the electrophotographic photosensitive member with a developer; (d) transferring the developed image onto a recording paper medium; and (e) thereafter eliminating charge from the electrophotographic photosensitive member by exposing it to light substantially free of rays having the wavelength band which may be absorbed by the charge-transporting material contained in said charge transport layer.
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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |