Manhole step

Description

FIG. 1 is a perspective view, taken from the upper right front, of a manhole step showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof; and

FIG. 7 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
109649 November 1870 Neefus
4241543 December 30, 1980 Foscarini et al.
Foreign Patent Documents
1964403 July 1971 DEX
Patent History
Patent number: D304376
Type: Grant
Filed: Sep 29, 1987
Date of Patent: Oct 31, 1989
Assignee: Lane International Corporation (Tualatin, OR)
Inventor: Michael K. Robertson (Tualatin, OR)
Primary Examiner: A. Hugo Word
Assistant Examiner: Doris Clark
Law Firm: Chernoff, Vilhauer, McClung & Stenzel
Application Number: 7/102,576
Classifications