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Patent
   D251805
Priority
May 19 1977
Filed
May 19 1977
Issued
May 08 1979
Expiry
May 08 1993
Inventors
Allmand, T…
Assg.orig
Assg.curr
Entity
unknown
Referenced by
3
References
2
Maint.:
n/a
The ornamental design for spiral staircase, substantially as shown.

FIG. 1 is a perspective view of a spiral staircase, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a greatly enlarged view thereof;

FIG. 4 is a greatly enlarged top plan view of one of the steps thereof; and

FIG. 5 is a greatly enlarged bottom plan view of one of the steps thereof.
INVENTORS:

Allmand, Thomas R.

THIS PATENT IS REFERENCED BY THESE PATENTS:
Patent Priority Assignee Title
4831706, Mar 21 1988 FLOOR TO FLOOR, INC Method of making spiral staircases
5737884, Sep 17 1996 Spiral stair case
D363096, Sep 29 1994 LEGO A S Staircase for a toy building set
THIS PATENT REFERENCES THESE PATENTS:
Patent Priority Assignee Title
3418770,
3513547,
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