Convex block

Description

FIG. 1 is a perspective view of a first embodiment of the convex block of my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof, the bottom view being a mirror image thereof;

FIG. 4 is an end view thereof, the opposite end being a mirror image thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front perspective view of a second embodiment of the convex block of my new design;

FIG. 7 is a front elevational view of FIG. 6;

FIG. 8 is a top plan view of FIG. 6, the bottom view being a mirror image thereof;

FIG. 9 is an end view of FIG. 6, the opposite end being a mirror image thereof;

FIG. 10 is a rear view of FIG. 6;

FIG. 11 is a perspective view of a third embodiment of the convex block of my new design;

FIG. 12 is a front view of FIG. 11;

FIG. 13 is a top view of FIG. 11, the bottom view being a mirror image thereof;

FIG. 14 is an end view of FIG. 11, the opposite end being a mirror image thereof;

FIG. 15 is a rear view of FIG. 11;

FIG. 16 is a front perspective view of a fourth embodiment of the convex block of my new design;

FIG. 17 is a front view of FIG. 16;

FIG. 18 is a top view of FIG. 16, the bottom view being the mirror image thereof;

FIG. 19 is an end view of FIG. 16, the opposite end being a mirror image thereof; and

FIG. 20 is a rear view of FIG. 16.

Referenced Cited
U.S. Patent Documents
126547 May 1872 Hickcox
228052 May 1880 Frost
566924 September 1896 Morrin
810748 January 1906 Haller et al.
1092621 April 1914 Worner
1414444 May 1922 Straight
1456498 May 1923 Binns
2235646 March 1941 Schaffer
2963828 December 1960 Belleveau
3036407 May 1962 Dixon
3274742 September 1966 Paul, Jr. et al.
3390502 July 1968 Carrol
3430404 March 1969 Muse
3557505 January 1971 Kaul
3936987 February 10, 1976 Calvin
3995434 December 7, 1976 Kato et al.
4110949 September 5, 1978 Cambiuzzi et al.
4207718 June 17, 1980 Schaaf et al.
4208850 June 24, 1980 Collier
4228628 October 21, 1980 Schlomann
4229123 October 21, 1980 Heinzmann
4335549 June 22, 1982 Dean
4454699 June 19, 1984 Strobl
4496266 January 29, 1985 Ruckstuhl
4524551 June 25, 1985 Scheiwiller
4572699 February 25, 1986 Rinninger
Foreign Patent Documents
392474 November 1908 FRX
1385207 February 1975 GBX
Other references
  • Concrete Masonry Pictorial, vol. 33, No. 3, .COPYRGT.1977, p. 5, Curved Masonry Unit at lower right. The Besser Company brochure, "Modular Concrete Block", 1984. The Besser Company brochure, "Paving Stone", Jun., 1984. The Besser Company Bulletin, Feb. 1985. The Hollow Building Tile Assoc. Handbook, p. 11, Jan. 1924.
Patent History
Patent number: D301064
Type: Grant
Filed: May 14, 1986
Date of Patent: May 9, 1989
Assignee: Keystone Retaining Wall Systems, Inc. (Edina, MN)
Inventor: Paul J. Forsberg (Richfield, MN)
Primary Examiner: A. Hugo Word
Law Firm: Burd, Bartz & Gutenkauf
Application Number: 6/863,399