RICHARD THOMAS JOHNSON I
Pilots at Jackson St, Prior Lake, MN

4345290, Aug 17, 1982

Sep 22, 1980

6/189607

Richard H. Johnson - Prior Lake MN

H02H 320

361 56

Apparatus for clipping excessive voltage transients in an alternating current power distribution system to protect the electrical system and attached electrical equipment from damage or failure due to said excessive high voltage transients and surges. Varistors are connected from each electrical phase to grounded conductor, referred to as neutral hereafter and also from neutral to ground to provide an additional fail-safe feature. This electrical circuit is contained within a cylindrically shaped hollow enclosure made of a high impact, polypropolene plastic. A plastic potting compound seals all the voids within the enclosure for additional electrical insulation. One end of the cylindrical enclosure terminates in a cap using rounded threads made of the same material as the cylinder which provides access for the circuit. The rounded threads provide protection against overtightening the cap. The opposite end has a threaded extension which mates with a standard electrical knockout and electrical lock nut for mounting.

4522455, Jun 11, 1985

Oct 11, 1983

6/540679

Richard H. Johnson - Prior Lake MN

H01R 1946

339 14R

A cover plate for an electrical receptacle outlet contains electrical circuits with flexible fingers which extend adjacent to the receptacle contacts such that the cover plate circuits are connected to the receptacle circuits by the prongs of a plug whenever a plug is inserted into the receptacle. The opposite end of the plate circuits extend into two cavities within the plate each of which can hold a matching module. Each module has flexible electrical contacts which press against each of the plate electrical circuits extensions to provide a connection from the receptacle circuit to the modules. The outer face of the cover plate adjacent to one of the modules has an opening to provide a path for either light or acoustic energy. The modules can contain any desired electrical circuits which can provide such functions as circuit protecting elements, pilot lights, alarm systems and detector systems as desired with no external wiring required.

D297427, Aug 30, 1988

Jun 21, 1985

6/747264

Richard H. Johnson - Prior Lake MN

D13 30