P

Inventor

GRUBBS CALVIN E

4 patents
⚠️ This page may combine multiple inventors who share the name “GRUBBS CALVIN E”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

THOMAS INDUSTRIES INC

3 patents
US4723098AFeb 2, 1988

Electronic ballast circuit for fluorescent lamps

THOMAS INDUSTRIES INC77 citations92
US4477748AOct 16, 1984

Solid state ballast

THOMAS INDUSTRIES INC56 citations92
US4435749AMar 6, 1984

High frequency inverter fault protection system

THOMAS INDUSTRIES INC9 citations70

ECC CORP

1 patent
US4042871AAug 16, 1977

Conversion system with overcurrent protection and start-up circuitry

ECC CORP16 citations66