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
Foreign Patent Documents
109649 | November 1870 | Neefus |
4241543 | December 30, 1980 | Foscarini et al. |
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
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
Current U.S. Class:
Stair Tread, Step Or Ladder Rung (D25/69)