US4353648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copy paper separating method for use in electrophotographic copying apparatus
Assignee: Minolta Co Ltd
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Filing: 1980-10-21
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Granted: 1982-10-12
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Expires: 2000-10-21
Abstract
Abstract A copy paper separating method for use in an electrophotographic copying apparatus which forms a latent electrostatic image on a recording member is provided. The method includes the step of depositing fine particles having insulating properties and charged to a polarity opposite of that of the toner image on the surface of the recording member before the copy paper is placed over the recording member, to cause the particles to reduce the electrostatic attraction between the copy paper and the recording member, thereby facilitating separation of the copy paper from said recording member.
Inventors
- 👤 Susumu Tanaka
- 👤 Tateki Oka
- 👤 Hiroshi Mizuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6532; G03G15/14; G03G15/16; G03G15/169
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
168 words
A copy paper separating method for use in an electrophotographic copying apparatus which forms a latent electrostatic image on a recording member, develops the latent image to a toner image, places copy paper over the toner image on the recording member, charges the rear side of the copy paper to a polarity opposite to that of the toner by corona discharge to transfer the toner image from the recording member to the front side of the copy paper, and thereafter separates the copy paper from the recording member, which comprises a step of depositing fine particles having insulating properties charged to a polarity opposite to that of the toner image on the surface of the recording member by a reversal developing process before the copy paper is placed over the recording member to cause the particles to reduce the electrostatic attraction between the copy paper and the recording member when the copy paper is to be separated from the recording member, thereby facilitating separation of the copy paper.
Claim 2
Dependent Claim
168 words
A copy paper separating method for use in an electrophotographic copying apparatus which forms a latent electrostatic image on a recording member, develops the latent image to a toner image, places copy paper over the toner image on the recording member, charges the rear side of the copy paper to a polarity opposite to that of the toner by corona discharge to transfer the toner image from the recording member to the front side of the copy paper, and thereafter separates the copy paper from the recording member, which comprises a step of depositing fine particles having insulating properties charged to a polarity opposite to that of the toner image on the surface of the recording member by a reversal developing process before the copy paper is placed over the recording member to cause the particles to reduce the electrostatic attraction between the copy paper and the recording member when the copy paper is to be separated from the recording member, thereby facilitating separation of the copy paper.
Claim 3
Dependent Claim
34 words
A copy paper separating method as claimed in claim 1, wherein said step comprises depositing the insulating fine particles on a nonimage area on the recording member during development by the reversal developing process.
Claim 4
Dependent Claim
34 words
A copy paper separating method as claimed in claim 1, wherein said step comprises depositing the insulating fine particles on a nonimage area on the recording member after development by the reversal developing process.
Claim 5
Dependent Claim
37 words
A copy paper separating method as claimed in any one of claims 1 to 3, wherein said insulating fine particles are of 10 to 30μ in average size and at least 10 13 ohm-cm in volume resistivity.
Claim 6
Dependent Claim
33 words
A copy paper separating method as claimed in claim 4, wherein said insulating fine particles consist of insulating magnetic particles prepared from an insulating resin having dispersed therein a finely divided magnetic material.
Claim 7
Dependent Claim
26 words
A copy paper separating method as claimed in claim 4, wherein said insulating fine particles consist of insulating nonmagnetic particles prepared from an insulating resin only.
References Cited (Backward Citations)
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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) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |