Obstruction marker light

Claim 1

A marker light assembly for use with a battery and light bulb, comprising: a blow molded unitary plastic canister having generally uniform thickness and having generally cylindrical upper and lower portions with the lower portions being dimensioned to receive the battery and with the diameter of the upper portion being larger than the diameter of the lower portion, said upper and lower portions being non-concentrically aligned with respect to one another and with their respective longitudinal axes being parallel, said lower portion including at least one array of four inwardly directed indentations, each said indentation in said array comprising a flat bottom the plane of which is generally parallel to the longitudinal axis of said lower portion, each said array of indentations comprising first and second pairs of indentations with the bottoms of the indentations in each said pair being parallel to one another and with the bottoms of the indentations in said first pair being perpendicular to the bottoms of the indentations in the second pair, the flat bottoms of the four indentations in said array defining four sides of a generally rectangular channel extending at least partly along the inside of said lower portion, said rectangular channel extending generally parallel to the longitudinal axis of said lower portion, said flat-bottom indentations further defining a plurality of hand grips on the outside of the lower portion; said lower portion including a plurality of said arrays of the inwardly directed flat-bottom identations, with said arrays being spaced apart, such that a generally circular array of outwardly extending grooves are disposed on the inside of said canister intermediate adjacent arrays; a circuit board assembly mounted in said canister, said circuit board assembly being electrically connected to the battery and the bulb; and a switch rigidly mounted in the upper portion of said canister and being electrically connected to said bulb and said circuit board assembly, whereby the generally rectangular channel defined on the inside of said lower portion by the array of indentions securely guides and retains the battery therein and whereby the indentations fascilitate secure gripping of the outside of the canister by a user thereof.