TREA

Step ladder

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Information

  • Patent Grant
  • D397228
  • Patent Number
    D397,228
  • Date Filed
    Thursday, June 5, 1997
    28 years ago
  • Date Issued
    Tuesday, August 18, 1998
    27 years ago
Information
Abstract
Description
Claims
  • The ornamental design for a step ladder, as shown and described.
US Referenced Citations (13)
Number Name Date Kind
D236244 Lary Aug 1975
4205411 Cupp et al. Jun 1980
4276955 Hickman Jul 1981
4485892 Maloney et al. Dec 1984
4557350 Wang Dec 1985
4653713 Hamilton Mar 1987
4706918 Wilson Nov 1987
4730802 Chatham et al. Mar 1988
4979590 Bailey Dec 1990
5370263 Brown Dec 1994
5421429 Evans Jun 1995
5542535 Dalton Aug 1996
5542553 Penniman Aug 1996
Foreign Referenced Citations (2)
Number Date Country
2093516 Feb 1982 GBX
2192025 Dec 1987 GBX
Non-Patent Literature Citations (7)
Entry
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.