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Soft White light bulb were developed by Marvin Pipkin (1889 – 1977) in 1949. Nearly 25 years earlier, Pipkin invented the inside frosted light bulb in 1925 [see A51]
. Soft White bulbs are produced by an application of tiny particles of silica to the interior surface of the bulb (called the Q-coat process) that gives the glass a smooth white surface and results in an even distribution of light, creating a “soft” glow and with almost no loss of light. More importantly, the annoying and sometimes dangerous bright glare of the bright filament is eliminated. Soft White light bulbs are produced to this day. Bulb should have the GE monogram, wattage and/or voltage etched on top of the bowl.
END: Evolution of Incandescent Light Bulbs