Richard P Crystal

US Patent:

40880737, May 9, 1978

Filed:

Dec 27, 1973

Appl. No.:

5/428962

Inventors:

Richard G. Crystal - Dallas TX
Frank J. Walton - Los Altos CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41C 114
B41N 124

US Classification:

1011284

Abstract:

A novel method for preparing a stencil master, a novel stencil and a method for printing therefrom are provided. The method for preparing the stencil comprises coating a suitable screen with a curable silicone containing a curing catalyst, depositing a particulate image pattern on said coated screen with a material which selectively inactivates said curing catalyst below said image pattern, curing the resultant nonimaged silicone to an elastomeric ink releasable condition and removing the particles from said particulate image pattern and the uncured silicone below said pattern to provide perforations in imagewise configuration. The method for printing comprises the additional steps of contacting the resultant screen with an image receiving member and passing ink through said perforations to thereby form an inked image on said receiving member.

US Patent:

40377067, Jul 26, 1977

Filed:

May 6, 1976

Appl. No.:

5/683977

Inventors:

Gordon Sohl - Richardson TX
David L. Bogert - Lewisville TX
Richard G. Crystal - Dallas TX
Michael C. Weisberg - San Carlos CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 130

US Classification:

197 54

Abstract:

A print element for an impact printer comprising a metal alloy insert member having a plurality of beams extending radially outward from a center section having an opening in the center thereof and a plurality of apertures spaced around the center opening and positioned between the center opening and the beams. Molded to the ends of the beams are character slugs having an impact surface engageable by hammer means, a print section having a print surface shaped in the form of a character and a capture section for coupling to the end of a beam whereby the energy imparted to the slug by a print hammer is substantially reflected in stresses in the print section of the slug rather than the capture section. A plastic hub is fixedly coupled to the insert member by a plurality of projections, each of which extends through a respective one of the apertures in the insert member and coacts therewith. The hub includes a flag extending radially outward a distance so as to expose a previously printed character when properly positioned relative thereto.

US Patent:

39510603, Apr 20, 1976

Filed:

Dec 27, 1973

Appl. No.:

5/428961

Inventors:

Richard G. Crystal - Dallas TX

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41M 110

US Classification:

101150

Abstract:

A process for preparing a waterless lithographic printing master is provided. A suitable substrate which is preferably ink accepting is coated with a silicone which is curable at low or ambient temperature and which contains in addition to its own catalyst a high temperature catalyst. The silicone is then cured at least on its surface to render it nontacky. A particulate image pattern is deposited on the cured silicone which pattern comprises a material which at elevated temperature combines with the high temperature catalyst to degrade the cured silicone below said image pattern, the composite heated to degrade the silicon below the image pattern and render the nonimaged areas ink releasing to the extent the silicone was not previously rendered ink releasing, and the particulate image pattern and preferably the degraded silicone removed beneath said pattern to reveal the ink accepting substrate in image configuration.

US Patent:

40643123, Dec 20, 1977

Filed:

Mar 14, 1975

Appl. No.:

5/558616

Inventors:

Richard G. Crystal - Dallas TX

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B32B 904

US Classification:

428447

Abstract:

A process for preparing a waterless lithographic printing master is provided. A suitable substrate, which is preferably ink accepting is first coated with a curable silicone which is curable at low or elevated temperature and a second different curable silicone deposited on said first silicone which can be preferentially cured at a lower temperature without curing the first silicone and which second silicone contains, in addition to its own catalyst, an amount of high temperature curing catalyst sufficient to cure the underlying silicone. The surface silicone is then preferentially cured at least on its surface to render it nontacky, but not the underlying silicone. A particulate image pattern is deposited on the surface cured silicone which pattern comprises a material which selectively inactivates the curing catalyst and combines with the catalyst to degrade the cured silicone below said image pattern at elevated temperature, the underlying silicone cured in the nonimaged areas to an elastomeric ink releasable condition, as well as the surface layer to the extent that it was not previously rendered ink releasing, and the particulate image pattern and preferably the degraded and uncured silicones removed beneath said pattern to reveal the ink accepting substrate in image configuration.

US Patent:

40122549, Mar 15, 1977

Filed:

Apr 28, 1975

Appl. No.:

5/572682

Inventors:

Richard G. Crystal - Dallas TX

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 504

US Classification:

96 15

Abstract:

Photoconductive waterless lithographic printing masters are provided having particle-to-particle contact of photoconductive material by placing a heterogeneous copolymer having an abhesive species and an imaging material adhesive species, in a solvent in which at least one of said species can be preferentially dissolved, preferentially dissolving one of said species and forming a suspension of photoconductive material in said soluble species, and coating the suspension on a suitable master substrate, allowing the solvent to evaporate, imaging the material with an ink accepting particulate imaging material in image configuration, and fusing the particulate imaging material to the coated master substrate while preferably effecting a phase inversion between the two species of the heterogeneous copolymer.