Slide calculator

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Description

FIG. 1 is a perspective view of a slide calculator showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a front elevational view, the rear elevational view being a mirror image thereof;

FIG. 4 is a bottom plan view; and

FIG. 5 is a right side elevational view, the left side elevational view being a mirror image thereof.

Referenced Cited
U.S. Patent Documents
D224259 July 1972 Raimondi
D254078 January 29, 1980 Van Exel
1866133 July 1932 Simon
2443882 June 1948 Allen
2452417 October 1948 Zentis
2532619 December 1950 Heerich
2777617 January 1957 Matt
3091389 May 1963 Wiken
4028529 June 7, 1977 Van de Weghe
4189634 February 19, 1980 LaBove et al.
4308450 December 29, 1981 Ausman et al.
Foreign Patent Documents
1064447 October 1979 CAX
19824 1899 GBX
789629 January 1958 GBX
Other references
  • Perry Graf; Calculator & Visualizer Brochure. Catalogue entitled, "Successful Promotions", by American Slide Chart Corporation, 1989.
Patent History
Patent number: D316868
Type: Grant
Filed: Mar 31, 1989
Date of Patent: May 14, 1991
Assignee: Schwan's Sales Enterprises, Inc. (Marshall, MN)
Inventor: Craig E. Johnson (West Chicago, IL)
Primary Examiner: Nelson C. Holtje
Assistant Examiner: Caron D. Veynar
Law Firm: Merchant, Gould, Smith, Edell, Welter & Schmidt
Application Number: 7/332,225
Classifications
Current U.S. Class: Slide Rule Type (D18/9)