Spiral staircase

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Description

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.

Referenced Cited
U.S. Patent Documents
3418770 December 1968 Allmand
3513547 May 1970 Suckno
Other references
  • Sweet's Architectural Catalog 1976, vol. 3, Section 6.9/dr, rear page, Posts on Spiral Staircase, top of page.
Patent History
Patent number: D251805
Type: Grant
Filed: May 19, 1977
Date of Patent: May 8, 1979
Inventor: Thomas R. Allmand (Ypsilanti, MI)
Primary Examiner: James M. Gandy
Attorney: D. Paul Weaver
Application Number: 5/798,617
Classifications
Current U.S. Class: Stepped (12) (D25/63); Stair Tread, Step Or Ladder Rung (D25/69)
International Classification: D2502;