Abstract Hectograph duplication is carried out by bringing a master sheet carrying a predetermined pattern of images which is formed with an image-forming material consisting essentially of a colorless color forming compound selected from N-bis(p''dimethylaminophenyl)methyl-m-hydroxymethyl-aniline and N-bis(p''dimethylaminophenyl)methyl-p- Beta -hydroxyethyl aniline and a vehicle into contact with a copying sheet coated with a reactive solid material effective for developing the colorless color forming compound after wetting the coated surface of the copying sheet with a volatile neutral organic liquid capable of dissolving the colorless color forming compound but not capable of adversely effecting the reactivity of the reactive solid material, and developing the colorless color forming compound transferred onto the coated surface of the copying sheet so as to produce violet blue images.
Inventors
👤 Y Miyazawa
👤 M Ozutsumi
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-31 06:07
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/025; B41M5/0253
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
16 words
A hectograph duplicating method as in claim 1, wherein the colorless color forming compound is N-bis(p''-dimethylaminophenyl)methyl-m-hydroxymethylaniline.
Claim 2
Dependent Claim
87 words
bringing the image-carrying surface of the master sheet into contact with the surface of a copying sheet which surface is coated with an acid reactive solid material effective for developing the colorless color forming compound of the master sheet after wetting the coated surface of the copying sheet with a volatile neutral duplicating fluid consisting essentially of a volatile alcohol effective for dissolving the colorless color forming compound of the master sheet without adversely effecting the reactivity of the reactive solid material of the copying sheet, and
Claim 3
Dependent Claim
19 words
A hectograph duplicating method as claimed in claim 1, wherein the colorless color foRming compound is N-bis(p''-dimethylaminophenyl)methyl-p- Beta -hydroxyethylaniline.
Claim 4
Dependent Claim
28 words
pressing the master sheet to the copying sheet, whereby the colorless color forming compound is transferred onto the copying sheet surface and developed into a color image thereon.
Claim 5
Dependent Claim
31 words
A hectograph duplicating method as claimed in claim 1, wheren the colorless color forming compound is in a amount of 50 to 200 percent based on the weight of the vehicle.
Claim 6
Dependent Claim
30 words
A hectograph duplicating method as claimed in claim 4, wherein the amount of the colorless color forming compound is 110 to 160 percent based on the weight of the vehicle.
Claim 7
Dependent Claim
37 words
A hectograph duplicating method as claimed in claim 1, wherein the image-forming material of the master sheet further comprises at most 2 percent of an organic or inorganic basic compound based on the weight of the vehicle.