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US 5,363,009 AGranted
Incandescent light with parallel grooves encompassing a bulbous portion
OwnerMark Montoinventor
Life of this patent
Estimating the term…
Abstract
An incandescent light has an evacuated envelope with a bulbous portion and a neck portion. The bulbous portion has a multiplicity of parallel grooves circling the bulbous portion longitudinally. The light also has an electrical filament centrally located in the bulbous portion of the envelope.
Claims17
An incandescent light bulb comprising:
- an evacuated envelope having a bulbous portion and a neck portion for containing a vacuum, said bulbous portion having a multiplicity of parallel grooves circling said bulbous portion longitudinally for focusing and directing light, said envelope at said bulbous portion having an opposing pair of external and internal surfaces, said bulbous portion being substantially ungrooved on one of said pair of surfaces, the other one of said pair of surfaces of said envelope having said grooves formed integrally thereon, said grooves alternating with ridges formed without an underlying gap on said envelope to act as a Fresnel lens, said ridges each having a wall extending between a distal corner at said ridge and a proximal corner at said groove;
- and
- an electrical filament centrally located in said bulbous portion of said envelope.
Dependencies are inferred from the claim text.