Step unit for a modular spiral staircase

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Description

FIG. 1 is a front elevational view of the step unit for a modular spiral staircase of the present invention;

FIG. 2 is a back elevational view of the step unit for a modular spiral staircase of FIG. 1;

FIG. 3 is a left side elevational view of the step unit for a modular spiral staircase of FIG. 1;

FIG. 4 is a right side elevational view of the step unit for a modular spiral staircase of FIG. 1;

FIG. 5 is a top plan view of the step unit for a modular spiral staircase of FIG. 1;

FIG. 6 is a bottom plan view of the step unit for a modular spiral staircase of FIG. 1; and,

FIG. 7 is a front elevational in use view of the step unit for a modular spiral staircase of FIG. 1.

The broken lines disclosing a spiral staircase is for illustrative purposes only, and forms no part of the claimed design.

Referenced Cited
U.S. Patent Documents
D225981 January 1973 Brown
D273231 March 27, 1984 Suckno
4587780 May 13, 1986 Rorke
Patent History
Patent number: D398063
Type: Grant
Filed: Oct 22, 1997
Date of Patent: Sep 8, 1998
Inventor: Anthony M. Kline (Brenham, TX)
Primary Examiner: Doris Clark
Application Number: 0/78,165
Classifications
Current U.S. Class: Stair Tread, Step Or Ladder Rung (D25/69)
International Classification: 2504;