Walter Albert Schwalm

US Patent:

44940475, Jan 15, 1985

Filed:

Jun 10, 1982

Appl. No.:

6/387174

Inventors:

Walter A. Schwalm - Lake Forest IL

International Classification:

H01J 2970
H01J 2976

US Classification:

315368

Abstract:

An electron beam convergence device is provided for a cathode ray tube of the type including an electron beam gun for developing three electron beams disposed on the screen in linear array. First and second rods formed of magnetic material and each including a plurality of pole pairs disposed along the rod are tangentially positioned on opposite sides of the neck of the cathode ray tube, with both axial (i. e. , linear) and rotatable motion of the first and second rods being permitted with respect to the cathode ray tube. Axial and rotatable motion of the first rod are operable to adjust the left beam without substantial movement of the center and right beams. Axial and rotatable motion of the second rod are operable to adjust the right beam without substantial movement of the left and center beams. A purity adjustment device may be provided which includes a manually adjustable rod formed of magnetic material and a pair of pole pieces extending from the rod and curving around a portion of the neck of the cathode ray tube to provide magnetic lines of force which are substantially straight with respect to the cathode ray tube.

US Patent:

D3404439, Oct 19, 1993

Filed:

Mar 6, 1991

Appl. No.:

7/665451

Inventors:

Walter A. Schwalm - Lake Forest IL

US Classification:

D13199

US Patent:

52220133, Jun 22, 1993

Filed:

Mar 6, 1991

Appl. No.:

7/665357

Inventors:

Walter A. Schwalm - Lake Forest IL

International Classification:

H05F 300

US Classification:

361212

Abstract:

An electrostatic discharge device which is secured over the cover of a wall mounted switch to provide a readily available instrument for discharging an electrostatic charge developed on the body of a person. The electrostatic discharge device includes in a series electrical circuit a grounded conductor, a current limiting resistor, an electrical discharge component, and an electrode for receiving a current flow to discharge an electrostatic charge.