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The ornamental design for a step stool, as shown and described. |
FIG. 1 is a front elevational view of a step stool showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left side elevational view, the right side being a mirror image thereof;
FIG. 6 is a cross-sectional view of the tread surfaces of FIG. 2 thereof;
FIG. 7 is a top plan view, of a second embodiment, the difference being in the removal of the diagonal tread strips on each step thereof;
FIG. 8 is a bottom plan view, the difference being in the removal of the rib structure under each step thereof; and,
FIG. 9 is a perspecitve view of the first embodiment of FIGS. 1-5.
Schwartzkopf, Robert A., Ruggles, Roy L.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Feb 12 1990 | RUGGLES, ROY L | COSCO, INC | ASSIGNMENT OF ASSIGNORS INTEREST | 005256 | /0329 | |
Feb 14 1990 | SCHWARTZKOPF, ROBERT A | COSCO, INC | ASSIGNMENT OF ASSIGNORS INTEREST | 005256 | /0329 | |
Feb 22 1990 | Cosco, Inc. | (assignment on the face of the patent) | / | |||
Jun 01 1998 | COSCO, INC | COSCO MANAGEMENT, INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 010263 | /0474 | |
Jun 01 1998 | COSCO, INC | COSCO MANAGEMENT, INC | RE-RECORD TO CORRECT PATENT NUMBER 4456303 PREVIOUSLY RECORDED AT REEL 010263, FRAME 0474 | 010814 | /0495 |
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