Portion of a light bulb

FIG. 1 is a front, right perspective view of a first embodiment of a portion of a light bulb showing my new design;

FIG. 2 is a front elevation view of the first embodiment of the portion of a light bulb;

FIG. 3 is a rear elevation view of the first embodiment of the portion of a light bulb;

FIG. 4 is a left elevation view of the first embodiment of the portion of a light bulb;

FIG. 5 is a right elevation view of the first embodiment of the portion of a light bulb;

FIG. 6 is a top plan view of the first embodiment of the portion of a light bulb;

FIG. 7 is a bottom plan view of the first embodiment of the portion of a light bulb;

FIG. 8 is a front, right perspective view of a second embodiment of a portion of a light bulb showing my new design;

FIG. 9 is a front elevation view of the second embodiment of the portion of a light bulb;

FIG. 10 is a rear elevation view of the second embodiment of the portion of a light bulb;

FIG. 11 is a left elevation view of the second embodiment of the portion of a light bulb;

FIG. 12 is a right elevation view of the second embodiment of the portion of a light bulb;

FIG. 13 is a top plan view of the second embodiment of the portion of a light bulb;

FIG. 14 is a bottom plan view of the second embodiment of the portion of a light bulb;

FIG. 15 is a front, right perspective view of a third embodiment of a portion of a light bulb showing my new design;

FIG. 16 is a front elevation view of the third embodiment of the portion of a light bulb;

FIG. 17 is a rear elevation view of the third embodiment of the portion of a light bulb;

FIG. 18 is a left elevation view of the third embodiment of the portion of a light bulb;

FIG. 19 is a right elevation view of the third embodiment of the portion of a light bulb;

FIG. 20 is a top plan view of the third embodiment of the portion of a light bulb;

FIG. 21 is a bottom plan view of the third embodiment of the portion of a light bulb;

FIG. 22 is a front, right perspective view of a fourth embodiment of a portion of a light bulb showing my new design;

FIG. 23 is a front elevation view of the fourth embodiment of the portion of a light bulb;

FIG. 24 is a rear elevation view of the fourth embodiment of the portion of a light bulb;

FIG. 25 is a left elevation view of the fourth embodiment of the portion of a light bulb;

FIG. 26 is a right elevation view of the fourth embodiment of the portion of a light bulb;

FIG. 27 is a top plan view of the fourth embodiment of the portion of a light bulb;

FIG. 28 is a bottom plan view of the fourth embodiment of the portion of a light bulb;

FIG. 29 is a front, right perspective view of a fifth embodiment of a portion of a light bulb showing my new design;

FIG. 30 is a front elevation view of the fifth embodiment of the portion of a light bulb;

FIG. 31 is a rear elevation view of the fifth embodiment of the portion of a light bulb;

FIG. 32 is a left elevation view of the fifth embodiment of the portion of a light bulb;

FIG. 33 is a right elevation view of the fifth embodiment of the portion of a light bulb;

FIG. 34 is a top plan view of the fifth embodiment of the portion of a light bulb;

FIG. 35 is a bottom plan view of the fifth embodiment of the portion of a light bulb;

FIG. 36 is a front, right perspective view of a sixth embodiment of a portion of a light bulb showing my new design;

FIG. 37 is a front elevation view of the sixth embodiment of the portion of a light bulb;

FIG. 38 is a rear elevation view of the sixth embodiment of the portion of a light bulb;

FIG. 39 is a left elevation view of the sixth embodiment of the portion of a light bulb;

FIG. 40 is a right elevation view of the sixth embodiment of the portion of a light bulb;

FIG. 41 is a top plan view of the sixth embodiment of the portion of a light bulb;

FIG. 42 is a bottom plan view of the sixth embodiment of the portion of a light bulb;

FIG. 43 is a front, right perspective view of a seventh embodiment of a portion of a light bulb showing my new design;

FIG. 44 is a front elevation view of the seventh embodiment of the portion of a light bulb;

FIG. 45 is a rear elevation view of the seventh embodiment of the portion of a light bulb;

FIG. 46 is a left elevation view of the seventh embodiment of the portion of a light bulb;

FIG. 47 is a right elevation view of the seventh embodiment of the portion of a light bulb;

FIG. 48 is a top plan view of the seventh embodiment of the portion of a light bulb;

FIG. 49 is a bottom plan view of the seventh embodiment of the light portion of a bulb;

FIG. 50 is a front, right perspective view of an eighth embodiment of a portion of a light bulb showing my new design;

FIG. 51 is a front elevation view of the eighth embodiment of the portion of a light bulb;

FIG. 52 is a rear elevation view of the eighth embodiment of the portion of a light bulb;

FIG. 53 is a left elevation view of the eighth embodiment of the portion of a light bulb;

FIG. 54 is a right elevation view of the eighth embodiment of the portion of a light bulb;

FIG. 55 is a top plan view of the eighth embodiment of the portion of a light bulb;

FIG. 56 is a bottom plan view of the eighth embodiment of the portion of a light bulb;

FIG. 57 is a front, right perspective view of a ninth embodiment of a portion of a light bulb showing my new design;

FIG. 58 is a front elevation view of the ninth embodiment of the portion of a light bulb;

FIG. 59 is a rear elevation view of the ninth embodiment of the portion of a light bulb;

FIG. 60 is a left elevation view of the ninth embodiment of the portion of a light bulb;

FIG. 61 is a right elevation view of the ninth embodiment of the portion of a light bulb;

FIG. 62 is a top plan view of the ninth embodiment of the portion of a light bulb;

FIG. 63 is a bottom plan view of the ninth embodiment of the portion of a light bulb;

FIG. 64 is a front, right perspective view of a tenth embodiment of a portion of a light bulb showing my new design;

FIG. 65 is a front elevation view of the tenth embodiment of the portion of a light bulb;

FIG. 66 is a rear elevation view of the tenth embodiment of the portion of a light bulb;

FIG. 67 is a left elevation view of the tenth embodiment of the portion of a light bulb;

FIG. 68 is a right elevation view of the tenth embodiment of the portion of a light bulb;

FIG. 69 is a top plan view of the tenth embodiment of the portion of a light bulb;

FIG. 70 is a bottom plan view of the tenth embodiment of the portion of a light bulb;

FIG. 71 is a front, right perspective view of an eleventh embodiment of a portion of a light bulb showing my new design;

FIG. 72 is a front elevation view of the eleventh embodiment of the portion of a light bulb;

FIG. 73 is a rear elevation view of the eleventh embodiment of the portion of a light bulb;

FIG. 74 is a left elevation view of the eleventh embodiment of the portion of a light bulb;

FIG. 75 is a right elevation view of the eleventh embodiment of the portion of a light bulb;

FIG. 76 is a top plan view of the eleventh embodiment of the portion of a light bulb; and,

FIG. 77 is a bottom plan view of the eleventh embodiment of the portion of a light bulb.

The broken lines in the drawings are for illustrative purposes and represent environmental structure and unclaimed portions of the portion of a light bulb and therefore form no part of the claimed design.