William L Grummer

46350756, Jan 6, 1987

Dec 4, 1985

6/804543

William L. Grummer - Canyon Country CA
Clifton A. Blake - Pasadena CA

Datametrics Corporation - Chatsworth CA

G01D 1510

346 76PH

An improved thermal printhead is disclosed which includes a plurality of addressable electrodes, each corresponding to a spot to be printed. In alternative embodiments, a single common electrode or a plurality of common electrodes are located in a plane below that of the addressable electrodes and are separated therefrom by an insulating layer. A portion of the common electrode is left exposed in the vicinity of each of the addressable electrodes and a covering of thermal resistive material electrically interconnects the two types of electrodes. Passage of a current through an addressable electrodes result in a current flow to the nearest points on a common electrode causing local heating in the resistive material. The electrode arrangement permits printing closer to the edge of the printhead and further, enables smaller, more clearly spaced printed "dots".

42064660, Jun 3, 1980

Mar 12, 1979

6/019792

William L. Grummer - Newbury Park CA

The United States of America as represented by the Secretary of the Navy - Washington DC

G01D 1506

346139C

A non-fouling print finger having an integral shield. The shield guides rdue passed the print stylus to a reduced area of the print finger body from whence the residue falls from the print finger. The shield also prevents excessive bending of the print stylus movable arm in the reverse direction during cleaning.