US3816840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic recording process and apparatus using conductive toner subject to a capacitive force
Assignee: 3M Co
•
Filing: 1973-04-20
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Granted: 1974-06-11
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Expires: 1993-04-20
Abstract
Abstract An electrographic process and device are provided wherein a dielectric recording member is arranged between two electrodes to one of which is adherably bound electronically conductive toner powder, the toner powder providing an electronically conductive path between the electrode to which it is bound and the adjacent surface of the dielectric member, and a voltage applied to the electrodes for a time and of a magnitude sufficient to generate a force pattern of intelligence on the toner which enables toner deposition on the recording member in accordance with the force pattern. The force pattern is generated directly on the toner rather than on the recording member which is passive in the operation of this invention.
Inventors
- 👤 A Kotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:05
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0914; G03G15/22; G03G15/34; G03G15/344; G03G15/348
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
23 words
arranging a passive dielectric recording member in said recording region with a first surface thereof in electronic contact with said second electrode means,
Claim 2
Dependent Claim
13 words
toner supply means for supplying electronically conductive toner to said first electrode means,
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein said first force is magnetic and said toner is magnetically attractable.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein said first electrode means has a relatively electronically conducting portion and a relatively electronically insulating portion.
Claim 5
Dependent Claim
86 words
providing electronically conductive toner between said first electrode means and a second surface of said dielectric recording member to form an electronically conductive path between said first electrode means and said second surface, said toner including at least a portion thereof in physical contact with said second surface of said dielectric recording member, whereby at least one electrical circuit between said electronically conductive portions of said first and second electrode means is provided, said toner being attracted to said first electrode means by a first force,
Claim 6
Dependent Claim
23 words
first force means associated with said first electrode means providing a first force holding said toner in association with said first electrode means,
Claim 7
Dependent Claim
113 words
transport means for providing relative transport of a passive dielectric recording member relative to at least one of said first and second electrode means through said recording region, said electronically conductive toner providing an electronically conductive path between one surface of said dielectric recording member and said first electrode means when said dielectric recording member is in said recording region with a portion of said toner in physical contact with said one surface, said second electrode means being in electronic contact with the surface of said dielectric recording member opposing said one surface, said arrangement providing at least one electrical circuit between said electronically conductive portions of said first and second electrode means,
Claim 8
Dependent Claim
116 words
applying an electrical potential to at least one of said circuits to cause electronic current to flow in said circuit whereby said portion of said toner in physical contact with said recording member is subjected to an electrical force pattern of intelligence determined by the electrical potential difference between said portion of said toner and said second electrode means and the electronic capacity of said portion of said toner with respect to said second electrode means, said force pattern including at least a first portion exerting a force on a part of said portion of said toner in contact with said dielectric recording member having a magnitude greater than and opposed to said first force, and
Claim 9
Dependent Claim
28 words
The process of claim 1 wherein said first and second electrode means are stationary relative to each other and said dielectric recording member moves through said recording region.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein said dielectric recording member and said second electrode means are moving in the same direction relative to said first electrode means.
Claim 11
Dependent Claim
45 words
removing said dielectric recording member from said recording region at a time after application of said electrical potential while said force pattern is present whereby toner is selectively deposited on said dielectric recording member in regions corresponding to said first portion of said force pattern.
Claim 12
Dependent Claim
125 words
electrical potential means adapted to apply an electrical potential to at least one of said circuits to cause electronic current to flow in said circuit whereby said portion of said toner in physical contact with said one surface of said recording member is subjected to an electrical force pattern of intelligence determined by the electrical potential difference between said portion of said toner and said second electrode means and the electronic capacity of said portion of said toner with respect to said second electrode means, said force pattern including at least a first portion exerting a force on a part of said portion of said toner in contact with said dielectric recording member having a magnitude greater than and opposed to said first force, and
Claim 13
Dependent Claim
49 words
means for relative transport of said dielectric recording member from said recording region at a time after application of said electrical potential while said force pattern is present whereby toner is selectively deposited on said dielectric recording member in regions corresponding to said first portion of said force pattern.
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein said dielectric recording member has an electronic resistivity of at least 107 ohms-centimeters.
Claim 15
Dependent Claim
34 words
The process of claim 1 wherein at least one of said first and second electrode means is composed of a photoconductive substance having an electronic resistivity in the dark of at least 108 ohms-centimeters.
Claim 16
Dependent Claim
13 words
The process of claim 1 wherein said dielectric recording member is a web.
Claim 17
Dependent Claim
16 words
The process of claim 1 wherein said first electrode means comprises an electronically conductive, cylindrical member.
Claim 18
Dependent Claim
25 words
The process of claim 1 wherein said toner has an electronic resistivity less than about 1010 ohm-cm. at an applied field of about 500 volts/cm.
Claim 19
Dependent Claim
16 words
The process of claim 1 wherein said second electrode means comprises an electronically conductive, cylindrical member.
Claim 20
Dependent Claim
17 words
The process of claim 1 wherein said dielectric recording member is bonded to said second electrode means.
Claim 21
Dependent Claim
25 words
The process of claim 1 wherein at least one of said first and second electrode means is a plurality of electronically conductive, electrically isolated styli.
Claim 22
Dependent Claim
17 words
The process of claim 13 wherein a time varying electrical potential is individually applied to said styli.
Claim 23
Dependent Claim
30 words
The process of claim 14 wherein said first force is magnetic, said toner is magnetically attractable, and at least one of said first and second electrode means is magnetically permeable.
Claim 24
Dependent Claim
91 words
The process of claim 1 wherein said first electrode means comprises a rotating, non-magnetically permeable electronically conductive cylindrical member, said second electrode means comprises a linear array of integral, electronically conductive, individual electrically isolated styli, said first force is magnetic, said toner is magnetically attractable, said first and second electrode means are stationary relative to each other and said dielectric recording member is a uniform web having a resistivity of at least 107 ohms-cm. moving through said recording region, and a time varying electrical potential is individually applied to said styli.
Claim 25
Dependent Claim
72 words
The process of claim 1 wherein said first electrode means comprises at least one magnetically permeable, electronically conductive, electrically isolated styli, said second electrode means is an electronically conductive rotating cylinder, said dielectric recording member has a resistivity of at least 107 ohms-cm. and is bonded to said second electrode means, said first force is magnetic, said toner is magnetically attractable, and a time varying electrical potential is applied to said styli.
Claim 26
Dependent Claim
32 words
The process of claim 1 wherein said second electrode means comprises relatively electronically conducting portions and relatively electronically insulating portions, and said second electrode means moves together with said dielectric recording member.
Claim 27
Dependent Claim
36 words
The process of claim 1 wherein at least one of said first and second electrode means has a second portion comprising regions of high conductivity and regions of low conductivity overlying an electronically conductive first portion.
Claim 28
Dependent Claim
38 words
The process of claim 1 wherein at least one of said first and second electrode means has a second portion comprising regions of relatively high dielectric constant and relatively low dielectric constant overlying an electronically conductive first portion.
Claim 29
Dependent Claim
17 words
The process of claim 1 wherein at least one of said electrode means has a unitary construction.
Claim 30
Independent Claim
3 words
An apparatus comprising:
Claim 31
Dependent Claim
12 words
The apparatus of claim 22 wherein said first force means is magnetic.
Claim 32
Dependent Claim
23 words
The apparatus of claim 22 wherein at least one of said first and second electrode means is at least one electronically conductive styli.
Claim 33
Dependent Claim
50 words
The apparatus of claim 22 wherein at least one of said first and second electrode means is an electronically conductive, circular, cylindrical shell and said first force means is a cylindrical magnetic member providing substantially radial lines of magnetic flux in said recording region, and said toner is magnetically attractable.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |