Patent US4933723A successfully refreshed from Google Patents.
US4933723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resin coated transfer guide for electrophotographic apparatus
Assignee: Ricoh Printing Systems Ltd
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Filing: 1988-06-03
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Granted: 1990-06-12
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Expires: 2008-06-03
Abstract
Abstract An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means of forming an electrostatic latent image on the photosensitive member by an electrostatic method, a means of developing the latent image with a developer, a means of conveying a recording medium onto which the developer image is transferred, and a means of transferring the developer image onto the recording medium, wherein, a guide installed in the means of conveying the recording medium is partly coated with a resin film, with which the recording medium is brought into contact, so as to have a volume resistivity of 1012 to 1016 OMEGA cm at normal temperature and humidity, that is, at 20 DEG C. and 50% RH and abrasion loss of 5 mg or below as measured in accordance with Taber's test method (load 1.0 Kg, revolution 70 rpm, total number of revolutions 1x103).
Inventors
- 👤 Atsushi Kakuta
- 👤 Tetsuo Ishikawa
- 👤 Makoto Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:55
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/163; G03G15/1635; G03G15/165; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means of forming an electrostatic latent image on said photosensitive member by an electrostatic method, a means of developing said latent image with a developer, a means of conveying a recording medium onto which the developer image is transferred, and a means of transferring the developer image onto the recording medium, wherein, a guide installed in said means of conveying the recording medium is partly coated with a resin-contained film, with which the recording medium is brought into contact, so as to have a volume resistivity of 10 12 to 10 16 Ωcm at normal temperature and humidity, that is, at 20° C. and 50% RH and abrasion loss of 5 mg or below as measured in accordance with Taber's test method (load 1.0 Kg, revolution 70 rpm, total number of revolutions 1×10 3 ).
Claim 2
Dependent Claim
144 words
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means of forming an electrostatic latent image on said photosensitive member by an electrostatic method, a means of developing said latent image with a developer, a means of conveying a recording medium onto which the developer image is transferred, and a means of transferring the developer image onto the recording medium, wherein, a guide installed in said means of conveying the recording medium is partly coated with a resin-contained film, with which the recording medium is brought into contact, so as to have a volume resistivity of 10 12 to 10 16 Ωcm at normal temperature and humidity, that is, at 20° C. and 50% RH and abrasion loss of 5 mg or below as measured in accordance with Taber's test method (load 1.0 Kg, revolution 70 rpm, total number of revolutions 1×10 3 ).
Claim 3
Dependent Claim
21 words
The electrophotographic apparatus of claim 1, wherein the surface of the resin coat has a pencil hardness of at least 6H.
Claim 4
Dependent Claim
115 words
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means of forming an electrostatic latent image on said photosensitive member by an electrostatic method, a means of developing said latent image with a developer, a means of conveying a recording medium onto which the developer image is transferred, and a means of transferring the developer image onto the recording medium, wherein a guide installed in said means of conveying the recording medium is partly coated with a poly(amide-imide) film, with which the recording medium is brought into contact; the poly(amide-imide) film having a volume resistivity of 10 2 to 10 16 Ωcm at normal temperature and humidity, that is, at 20° C. and 50% RH.
Claim 5
Dependent Claim
115 words
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means of forming an electrostatic latent image on said photosensitive member by an electrostatic method, a means of developing said latent image with a developer, a means of conveying a recording medium onto which the developer image is transferred, and a means of transferring the developer image onto the recording medium, wherein a guide installed in said means of conveying the recording medium is partly coated with a poly(amide-imide) film, with which the recording medium is brought into contact; the poly(amide-imide) film having a volume resistivity of 10 2 to 10 16 Ωcm at normal temperature and humidity, that is, at 20° C. and 50% RH.
Claim 6
Dependent Claim
122 words
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means of forming an electrostatic latent image on said photosensitive member by an electrostatic method, a means of developing said latent image with a developer, a means of conveying a recording medium onto which the developer image is transferred, and a means of transferring the developer image onto the recording medium, wherein a guide installed in said means of conveying the recording medium is partly coated with a poly(amide-imide) film, with which the recording medium is brought into contact; the abrasion loss of the poly(amide-imide) film being 5 mg or below as measured in accordance with Taber's test method (load 1.0 Kg, revolution 70 rpm, total number of revolutions 1 ×10 3 ).
Claim 7
Dependent Claim
122 words
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means of forming an electrostatic latent image on said photosensitive member by an electrostatic method, a means of developing said latent image with a developer, a means of conveying a recording medium onto which the developer image is transferred, and a means of transferring the developer image onto the recording medium, wherein a guide installed in said means of conveying the recording medium is partly coated with a poly(amide-imide) film, with which the recording medium is brought into contact; the abrasion loss of the poly(amide-imide) film being 5 mg or below as measured in accordance with Taber's test method (load 1.0 Kg, revolution 70 rpm, total number of revolutions 1 ×10 3 ).
Claim 8
Dependent Claim
99 words
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means of forming an electrostatic latent image on said photosensitive member by an electrostatic method, a means of developing said latent image with a developer, a means of conveying a recording medium onto which the developer image is transferred, and a means of transferring the developer image onto the recording medium, wherein a guide installed in said means of conveying the recording medium is partly coated with a poly(amide-imide) film, with which the recording medium is brought into contact; the poly(amide-imide) film having a molecular weight of at least 10,000.
Claim 9
Dependent Claim
99 words
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a means of forming an electrostatic latent image on said photosensitive member by an electrostatic method, a means of developing said latent image with a developer, a means of conveying a recording medium onto which the developer image is transferred, and a means of transferring the developer image onto the recording medium, wherein a guide installed in said means of conveying the recording medium is partly coated with a poly(amide-imide) film, with which the recording medium is brought into contact; the poly(amide-imide) film having a molecular weight of at least 10,000.
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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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |