Method of forming colored copy of an original

Claim 2

A COPYING METHOD COMPRISING THE STEPS OF:

Claim 3

DEPOSITING ON A LATENT ELECTROSTATIC IMAGE CARRIED ON A PHOTOCONDUCTIVE SUBSTRATE A PARTICLE IMAGE COMPRISING FINE POROUS PARTICLES OF SILICA OR ALUMINA HAVING A MEAN GRAIN SIZE FROM ABOUT 0.1 TO 500, AND HAVING ADSORBED THEREON AT LEAST ONE FIRST MEMBER OF A COLOR FORMING SET OF CHEMICAL COMPOUNDS;

Claim 4

DEPOSITING ON A LATENT ELECTROSTATIC IMAGE CARRIED ON A PHOTOCONDUCTIVE SUBSTRATE A PARTICLE IMAGE COMPRISING FINE POROUS PARTICLES OF SILICA OR ALUMINA HAVING A MEAN GRAIN SIZE FROM ABOUT 0.1 TO 500, AND HAVING ADSORBED THEREON AT LEAST ONE FIRST MEMBER OF A COLOR FORMING SET OF CHEMICAL COMPOUNDS;

Claim 5

BRINGING THE THUS FORMED PARTICLE IMAGE INTO FACE TO FACE CONTACT WITH THE COATED SURFACE OF A CARRIER SHEET, SAID COATING COMPRISING AT LEAST ONE SECOND MEMBER OF THE COLOR FORMING SET; AND

Claim 6

BRINGING THE THUS FORMED PARTICLE IMAGE INTO FACE TO FACE CONTACT WITH THE COATED SURFACE OF A CARRIER SHEET, SAID COATING COMPRISING AT LEAST ONE SECOND MEMBER OF THE COLOR FORMING SET; AND

Claim 7

A method according to claim 1, wherein the mean grain size of said fine particles is from about 1 to 200 Mu .

Claim 8

Bringing the thus formed particle image into face to face contact with the coated surface of a carrier sheet, said coating comprising at least one second member of the color forming set; and

Claim 9

Bringing the thus formed particle image into face to face contact with the coated surface of a carrier sheet, said coating comprising at least one second member of the color forming set; and

Claim 10

Heating to a temperature which during the period of contact and heating is not destructive of the photoconductive substrate or the carrier sheet to form a copy of said particle image on said carrier sheet; said color forming set comprising at least two chemical compounds which will react with each other to form a colored product during the heating period.

Claim 11

Heating to a temperature which during the period of contact and heating is not destructive of the photoconductive substrate or the carrier sheet to form a copy of said particle image on said carrier sheet; said color forming set comprising at least two chemical compounds which will react with each other to form a colored product during the heating period.

Claim 12

A method according to claim 1, wherein the amount of the first member adsorbed on the fine particles is from about 1 to 10 parts by weight based on 10 parts by weight of said particles.

Claim 13

HEATING TO A TEMPERATURE WHICH DURING THE PERIOD OF CONTACT AND HEATING IS NOT DESTRUCTIVE OF THE PHOTOCONDUCTIVE SUBSTRATE OR THE CARRIER SHEET TO FORM A COPY OF SAID PARTICLE IMAGE ON SAID CARRIER SHEET; SAID COLOR FORMING SET COMPRISING AT LEAST TWO CHEMICAL COMPOUNDS WHICH WILL REACT WITH EACH OTHER TO FORM A COLORED PRODUCT DURING THE HEATING PERIOD.

Claim 14

HEATING TO A TEMPERATURE WHICH DURING THE PERIOD OF CONTACT AND HEATING IS NOT DESTRUCTIVE OF THE PHOTOCONDUCTIVE SUBSTRATE OR THE CARRIER SHEET TO FORM A COPY OF SAID PARTICLE IMAGE ON SAID CARRIER SHEET; SAID COLOR FORMING SET COMPRISING AT LEAST TWO CHEMICAL COMPOUNDS WHICH WILL REACT WITH EACH OTHER TO FORM A COLORED PRODUCT DURING THE HEATING PERIOD.

Claim 15

A method according to claim 1, wherein the step of depositing comprises cascading the fine particles over the photoconductive layer.

Claim 16

A method according to claim 1, wherein the heating-temperature is from about 50* to 120*C.

Claim 17

A method according to claim 1, wherein the firSt member is selected from the group consisting of (a) Crystal Violet lactone, (b) dianisidine base, (c) 4-nitro-O-anisidine, (d) Rhodamine lactone, (e) gallic acid, (f) monoethanol amine, (g) 2,3-dihydroxy naphthalene, (h) 8-amino-1-naphthol-5,7,-disulfonic acid, (i) 4-methoxy-1-naphthol, (j) 1-phenyl-3-carboxy pyrazolone, (k) phloroglucinol and (l) 3-hydroxy-1-phenol; the second member is selected from the group consisting of (m) attapulgite clay, (n) ammonium methavandate, (o) copper sulfate, (p) 2-diazo-4-chloro-1-phenol, (q) 4-diazo dipropyl aniline and (r) 4-diazo ethylbenzyl aniline; and the combination of the members is (a) and (m), (b) and (m), (c) and (m), (d) and (m), (e) and (n), (f) and (o), (g) and (p), (h) and (p), (g) and (q), (g) and (r), (i) and (q), (j) and (q), (j) and (r), (k) and (q), and (l) and (r).