Step ladder

- Werner Co.
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
D236244 August 1975 Lary
4205411 June 3, 1980 Cupp et al.
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
5421429 June 6, 1995 Evans
5542535 August 6, 1996 Dalton
5542553 August 6, 1996 Penniman
Foreign Patent Documents
2093516 February 1982 GBX
2192025 December 1987 GBX
Other references
  • 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
Classifications
Current U.S. Class: Step Stool Type (D25/65)
International Classification: 2504;