1
Kurz Philip F, Nash Leonard A: Electrostatically improvement in electo static printing. Teletype Corporation, February 6, 1973: US3715219 (52 worldwide citation)

An ink having a resistivity in the range of 10.sup.6 to 10.sup.11 ohm-centimeters and a viscosity in a range with an upper limit of about 50 centipoises synchronously is formed into a uniform succession of ink drops in response to an alternating current. A stream of the ink drops is electrostaticall ...


2
Reif Robert B, Kurz Philip F: Irreversible humidity indicator. The United States of America represented by the United States Energy, Carlson Dean E, Churm Arthur A, Glenn Hugh W, August 5, 1975: US3898172 (27 worldwide citation)

Particles of colored dye are distributed over the surface of a dry, deliquescent salt having a neutral color. When exposed to a humidity level above that which causes deliquescence of the salt, the dye bleeds through and imparts its developed tincture to the resulting saturated salt solution. On deh ...