Step ladder
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Description
FIG. 1 is perspective view of a first embodiment of the invention;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof, being the mirror of the right side view; and,
FIG. 5 is a top view thereof;
FIG. 6 is a perspective view of a second embodiment of the invention;
FIG. 7 is a front view thereof;
FIG. 8 is a rear view thereof;
FIG. 9 is a left side view thereof, being the mirror of the right side view; and,
FIG. 10 is a top view thereof; and,
FIG. 11 is a perspective view of a third embodiment of the present invention, the top, left, and rear being substantially consistent with the top, left, and rear of the step ladder of the first embodiment.
Referenced Cited
U.S. Patent Documents
Foreign Patent Documents
Other references
D236244 | August 1975 | Lary |
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4276955 | July 7, 1981 | Hickman |
4485892 | December 4, 1984 | Maloney et al. |
4557350 | December 10, 1985 | Wang |
4653713 | March 31, 1987 | Hamilton |
4706918 | November 17, 1987 | Wilson |
4730802 | March 15, 1988 | Chatham et al. |
4979590 | December 25, 1990 | Bailey |
5370263 | December 6, 1994 | Brown |
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5542535 | August 6, 1996 | Dalton |
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- Cosco brochure, ladder model No. 11-740 "Tri Step Work Platform" (1995). Cosco brochure, ladder model No. 11-780 "Pro Step" (1995). Cosco brochure, "Pro Fold" ladder (1995). Cosco brochure, ladder model No. 11-725 (1995). Cosco brochure, ladder models 11-300 and 11-307 (1995). Cosco brochure, ladder models 11-135 and 11-302 (1995). U.S. Design Patent Application No. 29/048,682 Patent #D388882 Patent date Jan. 6, 1998.
Patent History
Patent number: D397228
Type: Grant
Filed: Jun 5, 1997
Date of Patent: Aug 18, 1998
Assignee: Werner Co. (Greenville, PA)
Inventors: Randall Bell (River Forest, IL), Walter Herbst (Lake Forest, IL), Eric C. Horne (Greenville, PA), Edward E. Heald (Greenville, PA)
Primary Examiner: Doris Clark
Law Firm: Howrey & Simon
Application Number: 0/71,723
Type: Grant
Filed: Jun 5, 1997
Date of Patent: Aug 18, 1998
Assignee: Werner Co. (Greenville, PA)
Inventors: Randall Bell (River Forest, IL), Walter Herbst (Lake Forest, IL), Eric C. Horne (Greenville, PA), Edward E. Heald (Greenville, PA)
Primary Examiner: Doris Clark
Law Firm: Howrey & Simon
Application Number: 0/71,723
Classifications