Patent
   D304376
Priority
Sep 29 1987
Filed
Sep 29 1987
Issued
Oct 31 1989
Expiry
Oct 31 2003
Assg.orig
Entity
unknown
8
3
n/a
The ornamental design for a manhole step, as shown.

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.

Robertson, Michael K.

Patent Priority Assignee Title
D371854, Aug 12 1994 FIRST NATIONAL BANK OF CHICAGO, THE Ladder rung
D429002, Aug 05 1999 MIYAMA KOGYO CO , LTD Step for climbing wall surface
D429003, Aug 05 1999 MIYAMA KOGYO CO , LTD Step for climbing wall surface
D435118, Dec 22 1998 MIYAMA KOGYO CO , LTD Step for climbing wall surface
D452742, Apr 15 1999 MIYAMA KOGYO CO , LTD Step for climbing wall surface
D490907, Jul 17 2003 M A INDUSTRIES, INC Two-sided manhole step
D556917, Jul 09 2004 M.A. Industries, Inc. Two sided manhole step
D839451, Oct 17 2017 M.A. Industries, Inc. Manhole step
Patent Priority Assignee Title
109649,
4241543, Dec 20 1978 Method of installing manhole safety steps and plugs therefor
DE1964403,
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Sep 28 1987ROBERTSON, MICHAEL K LANE INTERNATIONAL CORPORATION, 18067 S W LOWER BOONES FERRY RD , TUALATIN, OREGON 97062, A OREGON CORP ASSIGNMENT OF ASSIGNORS INTEREST 0048030450 pdf
Sep 29 1987Lane International Corporation(assignment on the face of the patent)
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