US4034709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer roll
Assignee: Xerox Corp
•
Filing: 1975-10-22
•
Granted: 1977-07-12
•
Expires: 1995-10-22
Abstract
Abstract An apparatus which renders a latent image visible by depositing developer material thereon. The apparatus includes a tubular member having a styrene-butadiene layer coated on a nonmagnetic roll. Magnets are disposed interiorly of the tubular member to attract the developer material thereto. The developer material is transported into contact with the latent image to produce a powder image thereon.
Inventors
- 👤 Lawrence J. Fraser
- 👤 Delmer G. Parker
- 👤 Joseph L. Scaletta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:55
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
150 words
An apparatus for depositing a developer material on a surface having a latent image recorded thereon, including: a tubular member comprising a hollow substantially non-magnetic roll with a layer of styrene-butadiene having conductive particles dispersed therethrough being coated on the exterior circumferential surface of the roll and having a surface finish at least of a magnitude sufficient to transport the developer material to the latent image, the layer coated on the roll of said tubular member preferably having a resistivity ranging from about 10 2 ohm-centimeters to about 10 8 ohm-centimeters, and the layer comprising about 87 percent styrene-butadiene by weight and about 13 percent conductive particles by weight; and magnetic means disposed within the roll of said tubular member for creating a magnetic field about at least a portion of the periphery of said tubular member to attract magnetically the developer material to the layer on the roll thereof.
Claim 2
Independent Claim
150 words
An apparatus for depositing a developer material on a surface having a latent image recorded thereon, including: a tubular member comprising a hollow substantially non-magnetic roll with a layer of styrene-butadiene having conductive particles dispersed therethrough being coated on the exterior circumferential surface of the roll and having a surface finish at least of a magnitude sufficient to transport the developer material to the latent image, the layer coated on the roll of said tubular member preferably having a resistivity ranging from about 10 2 ohm-centimeters to about 10 8 ohm-centimeters, and the layer comprising about 87 percent styrene-butadiene by weight and about 13 percent conductive particles by weight; and magnetic means disposed within the roll of said tubular member for creating a magnetic field about at least a portion of the periphery of said tubular member to attract magnetically the developer material to the layer on the roll thereof.
Claim 3
Dependent Claim
22 words
An apparatus as recited in claim 1, further including means for producing relative rotation between said magnetic means and said tubular member.
Claim 4
Dependent Claim
38 words
An apparatus as recited in claim 2, further including: a housing defining a chamber for storing the developer material therein; and means for advancing the developer material from the storage chamber of said housing to said tubular member.
Claim 5
Dependent Claim
27 words
An apparatus as recited in claim 3, wherein the layer coated on the roll of said tubular member preferably has a resistivity of about 10 5 ohm-centimeters.
Claim 6
Dependent Claim
26 words
An apparatus as recited in claim 4, wherein the conductive particles dispersed in the layer coated on the roll of said tubular member include carbon black.
Claim 7
Dependent Claim
21 words
An apparatus as recited in claim 5, wherein the roll of said tubular member is preferably made from a non-magnetic metal.
Claim 8
Dependent Claim
21 words
An apparatus as recited in claim 5, wherein the roll of said tubular member is preferably made from a phenolic material.
Claim 9
Dependent Claim
160 words
An electrophotographic printing machine of the type having an electrostatic latent image recorded on a photoconductive member developed with a developer material, wherein the improvement includes: a tubular member comprising a hollow substantially non-magnetic roll with a layer of styrene-butadiene having conductive particles dispersed therethrough being coated on the exterior circumferential surface of the roll and having a surface finish at least of a magnitude sufficient to transport the developer material to the electrostatic latent image, the layer coated on the roll of said tubular member preferably having a resistivity ranging from about 10 2 ohm-centimeters to about 10 8 ohm-centimeters, and the layer comprising about 87 percent styrene-butadiene by weight and about 13 percent conductive particles by weight; and magnetic means disposed within the roll of said tubular member for creating a magnetic field about at least a portion of the periphery of said tubular member to attract magnetically the developer material to the layer on the roll thereof.
Claim 10
Dependent Claim
160 words
An electrophotographic printing machine of the type having an electrostatic latent image recorded on a photoconductive member developed with a developer material, wherein the improvement includes: a tubular member comprising a hollow substantially non-magnetic roll with a layer of styrene-butadiene having conductive particles dispersed therethrough being coated on the exterior circumferential surface of the roll and having a surface finish at least of a magnitude sufficient to transport the developer material to the electrostatic latent image, the layer coated on the roll of said tubular member preferably having a resistivity ranging from about 10 2 ohm-centimeters to about 10 8 ohm-centimeters, and the layer comprising about 87 percent styrene-butadiene by weight and about 13 percent conductive particles by weight; and magnetic means disposed within the roll of said tubular member for creating a magnetic field about at least a portion of the periphery of said tubular member to attract magnetically the developer material to the layer on the roll thereof.
Claim 11
Dependent Claim
23 words
A printing machine as recited in claim 8, further including means for producing relative rotation between said magnetic means and said tubular member.
Claim 12
Dependent Claim
39 words
A printing machine as recited in claim 9, further including: a housing defining a chamber for storing the developer material therein; and means for advancing the developer material from the storage chamber of said housing to said tubular member.
Claim 13
Dependent Claim
28 words
A printing machine as recited in claim 10, wherein the layer coated on the roll of said tubular member preferably has a resistivity of about 10 5 ohm-centimeters.
Claim 14
Dependent Claim
27 words
A printing machine as recited in claim 11, wherein the conductive particles dispersed in the layer coated on the roll of said tubular member include carbon black.
Claim 15
Dependent Claim
22 words
A printing machine as recited in claim 12, wherein the roll of said tubular member is preferably made from a nonmagnetic metal.
Claim 16
Dependent Claim
22 words
A printing machine as recited in claim 12, wherein the roll of said tubular member is preferably made from a phenolic material.
References Cited (Backward Citations)
US3909258A
Cited
US3863603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |