Riser Apparatus

FIG. 1 is a top perspective view of a riser apparatus in accordance with a first embodiment of our design; FIG. 2 is a bottom perspective view of the riser apparatus of FIG. 1 ; FIG. 3 is a front elevational view of the riser apparatus of FIG. 1 ; FIG. 4 is a rear elevational view of the riser apparatus of FIG. 1 ; FIG. 5 is a left side elevational view of the riser apparatus of FIG. 1 ; FIG. 6 is a right side elevational view of the riser apparatus of FIG. 1 ; FIG. 7 is a top plan view of the riser apparatus of FIG. 1 ; FIG. 8 is a bottom plan view of the riser apparatus of FIG. 1 ; FIG. 9 is a top perspective view of a riser apparatus in accordance with a second embodiment of our design; FIG. 10 is a bottom perspective view of the riser apparatus of FIG. 9 ; FIG. 11 is a front elevational view of the riser apparatus of FIG. 9 ; FIG. 12 is a rear elevational view of the riser apparatus of FIG. 9 ; FIG. 13 is a left side elevational view of the riser apparatus of FIG. 9 ; FIG. 14 is a right side elevational view of the riser apparatus of FIG. 9 ; FIG. 15 is a top plan view of the riser apparatus of FIG. 9 ; FIG. 16 is a bottom plan view of the riser apparatus of FIG. 9 ; FIG. 17 is a top perspective view of a riser apparatus in accordance with a third embodiment of our design; FIG. 18 is a bottom perspective view of the riser apparatus of FIG. 17 ; FIG. 19 is a front elevational view of the riser apparatus of FIG. 17 ; FIG. 20 is a rear elevational view of the riser apparatus of FIG. 17 ; FIG. 21 is a left side elevational view of the riser apparatus of FIG. 17 ; FIG. 22 is a right side elevational view of the riser apparatus of FIG. 17 ; FIG. 23 is a top plan view of the riser apparatus of FIG. 17 ; and, FIG. 24 is a bottom plan view of the riser apparatus of FIG. 17 . The broken lines having consistent dash lengths (dash-dash-dash) in the Figures represent portions of the riser apparatus that form no part of the claimed design. Embodiment 3 , FIGS. 17 - 24 show broken lines representing a symbolic break in the length of the riser apparatus. Any portion of the article between the break lines forms no part of the claim.