Lawrence R Fraser

US Patent:

40820610, Apr 4, 1978

Filed:

Mar 14, 1977

Appl. No.:

5/777377

Inventors:

Lawrence J. Fraser - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1509

US Classification:

118645

Abstract:

An apparatus arranged to develop a latent image recorded on a member with particles stored in the chamber of the housing. A plurality of differently colored particles are housed remotely from the chamber. Particles of a selected color are advanced to the chamber so as to be deposited on the latent image. The foregoing abstract is neither intended to define the invention disclosed in the specification, nor is it intended to be limiting as to the scope of the invention in any way.

US Patent:

40871681, May 2, 1978

Filed:

Jan 19, 1976

Appl. No.:

5/650399

Inventors:

Lawrence J. Fraser - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1500
G03G 1502

US Classification:

355 3CH

Abstract:

A xerographic system, particularly color, is disclosed. To offset the side effects of the relatively high bias potentials applied to the magnetic brush developer roll or rolls and the tendency thereof to create fields adverse to edge and fringe development, a field sensitive corona generating device is provided to raise potentials of the image background areas after exposure but before development.

US Patent:

49357883, Jun 19, 1990

Filed:

Jun 16, 1988

Appl. No.:

7/207421

Inventors:

Joseph Fantuzzo - Webster NY
Lawrence J. Fraser - Rochester NY
Edwin R. Monkelbaan - Fairport NY
Thomas Robson - Penfield NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1501

US Classification:

355326

Abstract:

A multicolor printing system of the type in which a plurality of latent images are recorded therein. Each one of the plurality of latent images are developed with a different color liquid developer material to form a plurality of different color liquid images. The different color liquid images are transferred, in superimposed registration with one another, to an intermediate member to form a multicolor liquid image thereon. Thereafter, the multicolor liquid image is, in turn, transferred to a sheet and fused thereto.

US Patent:

43469850, Aug 31, 1982

Filed:

Jun 25, 1979

Appl. No.:

6/051650

Inventors:

P. Keith Watson - Rochester NY
Lawrence J. Fraser - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1500

US Classification:

355 14D

Abstract:

An automatic development control for use in an electrophotographic apparatus. The control includes a pair of substantially planar members forming a channel therebetween through which developer flows. One of the members is constructed such that an electrostatic charge pattern is periodically formed on the surface thereof, the charge pattern being developed by the attraction of toner thereto which toner has a charge opposite to that forming the charge pattern. The member on which the developed charge pattern is formed includes a uniform, transparent conducting substrate covered with a transparent insulating layer on top of which is deposited a set of spaced-apart, opaque and electrically conducting fingers. Thus, the one member includes alternate opaque and transparent areas. By grounding the electrically conducting fingers which are all interconnected and by driving the substrate alternately positive and negative, toner is deposited on the transparent areas during the application of one half cycle of voltage and during the following half cycle the toner is deposited on the opaque fingers and scavenged from the transparent areas.

US Patent:

39500896, Apr 13, 1976

Filed:

Feb 24, 1975

Appl. No.:

5/552010

Inventors:

Lawrence J. Fraser - Rochester NY
Delmer G. Parker - Rochester NY
Joseph L. Scaletta - Henrietta NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1500

US Classification:

355 3DD

Abstract:

To realize the advantages which sometimes attach to the use of electrically conductive carrier particles, the electrodes within development systems and cleaning systems for electrostatographic processors, such as xerographic copiers and duplicators, are coated or otherwise held in intimate contact with a sufficiently thick layer of material having a resistivity which is selected to prevent carrier caused short circuit events from producing irreversible damage and to localize the effects of such events. As a general rule, a 1-25 mil thick layer of a material having a resistivity in the range of 10. sup. 7 - 10. sup. 9 ohm. sup. cm is adequate for that purpose.

US Patent:

40009440, Jan 4, 1977

Filed:

Feb 18, 1975

Appl. No.:

5/550301

Inventors:

Lawrence J. Fraser - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1500

US Classification:

355 14

Abstract:

An electrostatic type copying or reproduction machine incorporating, as an integral, part of the machine photoconductive member, a signal generating electrode for use in controlling one or more of the machine processing parameters.

US Patent:

40672956, Jan 10, 1978

Filed:

Jul 16, 1976

Appl. No.:

5/705974

Inventors:

Delmer G. Parker - Irondequoit NY
Lawrence J. Fraser - Rochester NY
Joseph L. Scaletta - Henrietta NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1508
G03G 1509

US Classification:

118653

Abstract:

A magnetizable donor is magnetized to define a microfield with a characteristic spacing between pole centers of about 0. 010 inches. The strong short range fields between poles pick up and hold a thin uniform and continuous layer of magnetic toner. The layer of toner is then electrostatically charged and brought into close proximity to a receptor, without touching the same, where only latent image areas of the receptor attract toner from the donor layer.

US Patent:

40347095, Jul 12, 1977

Filed:

Oct 22, 1975

Appl. No.:

5/625435

Inventors:

Lawrence J. Fraser - Rochester NY
Delmer G. Parker - Irondequoit NY
Joseph L. Scaletta - Henrietta NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1306

US Classification:

118658

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.