Back to results
US 4,288,713 AGranted
Lamp having opaque coating
AssigneeGTE Products Corporation
InventorRichard C. Marlor
Life of this patent
Estimating the term…
Abstract
An incandescent lamp has on a portion of the lamp envelope a dark coating comprising manganese dioxide and aluminum phosphate.
Claims6
In an incandescent lamp including at least one tungsten filament disposed within a glass envelope, the improvement comprising an opaque coating on a portion of the envelope for preventing transmission of light therethrough, the coating comprising a dark mixture of manganese dioxide and aluminum phosphate.
Dependencies are inferred from the claim text.