An Historical Look at the Copying Business

by David Jenyns on February 27, 2009

Broadly speaking, we have the following five basic photocopying processes in use:

1.Thermo Fax process—The simplest and most widespread process used was developed by Minnesota Mining & Mfg.

2.Transfer-diffusion process—This process is used by American Photocopy, Sperry Rand’s Remington Rand, and others, and is more closely akin to photography, except that no lens is used.


3.Dye-transfer process—This process is similar to the transfer diffusion process except that the negative is coated with a type of dye.

4.Diazo process—According to this process, paper to be copied is placed directly over a sheet coated with diazonium salt, and the two are exposed to ultraviolet light. This process is utilized by Charles Bruning and Ozalid (General Aniline & Film) for heavy-volume copying at low cost.

5.Electrostatic process—This process is also called xerography because it was developed by Xerox Corp. for its xerography machines. Among the leading photocopy issues, Xerox Corp. and American Photocopy appear favorably situated. American Photocopy’s Electrostat desk-top copying device is also in good demand.

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