Spiral staircase

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Description

FIG. 1 is a front elevation of a spiral staircase displaying the face of lowest step;

FIG. 2 is a right side elevation showing the upper landing of the spiral staircase;

FIG. 3 is a left side elevation showing the back section of the spiral staircase;

FIG. 4 is a rear elevation of the spiral staircase 180.degree. opposed to the view presented in FIG. 1;

FIG. 5 is a top plan view of the spiral staircase;

FIG. 6 is a bottom plan view of the spiral staircase;

FIG. 7 is a front perspective view of the spiral staircase.

Referenced Cited
U.S. Patent Documents
D273231 March 27, 1984 Suckno
3513547 May 1970 Suckno
Other references
  • Designing Staircases by Willbald Mannes, c. 1974, p. 17, FIG. 3.6.3.
Patent History
Patent number: D282103
Type: Grant
Filed: Apr 4, 1983
Date of Patent: Jan 7, 1986
Inventor: Raymond Gregoire (Stoneham, MA)
Primary Examiner: A. Hugo Word
Law Firm: Hamilton, Brook, Smith & Reynolds
Application Number: 6/481,785
Classifications
Current U.S. Class: Stepped (12) (D25/63)