Convex block

Description

FIG. 1 is a front perspective view of a convex block showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is an end elevational view, the opposite end being a mirror image thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a front perspective view of a second embodiment of a convex block showing my new design;

FIG. 8 is a top plan view of FIG. 7;

FIG. 9 is a front elevational view of FIG. 7;

FIG. 10 is a bottom plan view of FIG. 7;

FIG. 11 is a side elevational view of FIG. 7, the opposite side being a mirror image thereof;

FIG. 12 is a rear elevational of FIG. 7;

FIG. 13 is a front perspective view of a third embodiment of a convex block showing my new design;

FIG. 14 is a top plan view of FIG. 13;

FIG. 15 is a front elevational view of FIG. 13;

FIG. 16 is a bottom plan view of FIG. 13;

FIG. 17 is an end elevational view of FIG. 13, the opposite end being a mirror image thereof;

FIG. 18 is a rear elevational view of FIG. 13;

FIG. 19 is a front prospective view of a fourth embodiment of the convex block showing my new design;

FIG. 20 is a top plan view of FIG. 19;

FIG. 21 is a front elevational view of FIG. 19;

FIG. 22 is a bottom plan view of FIG. 19;

FIG. 23 is a side elevational view of FIG. 19, the opposite side being a mirror image thereof;

FIG. 24 is a rear elevational view of FIG. 19;

FIG. 25 is a front perspective view of a fifth embodiment of a convex block showing my new design;

FIG. 26 is a top plan view of FIG. 25;

FIG. 27 is a front elevational view of FIG. 25;

FIG. 28 is a bottom plan view of FIG. 25;

FIG. 29 is a side elevational view of FIG. 25, the opposite side being a mirror image thereof; and

FIG. 30 is a rear elevational view of FIG. 25.

Referenced Cited
U.S. Patent Documents
D119606 March 1940 Bebar
126547 May 1872 Hickcox
228052 May 1880 Frost
D237704 November 1975 Lane
D301064 May 9, 1989 Forsberg
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
2882689 April 1959 Huch et al.
2963828 December 1960 Belliveau
3036407 May 1962 Dixon
3274742 September 1966 Paul, Jr. et al.
3390502 July 1968 Carroll
3430404 March 1969 Muse
3557505 January 1971 Kaul
3936987 February 10, 1976 Calvin
3995434 December 7, 1976 Kato et al.
4016693 April 12, 1977 Warren
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
4312606 January 26, 1982 Sarikelle
4335549 June 22, 1982 Dean, Jr.
4454699 June 19, 1984 Strobl
4496266 January 29, 1985 Ruckstuhl
4524551 June 25, 1985 Scheiwiller
4572699 February 25, 1986 Rinninger
4738059 April 19, 1988 Dean, Jr.
Foreign Patent Documents
392474 November 1908 FRX
1360872 April 1964 FRX
205452 September 1939 CHX
336 1871 GBX
1385207 February 1975 GBX
2127872 April 1984 GBX
Other references
  • The Hollow Building Handbook, p. 11, Jan. 1924. Concrete Masonry Pictorial, vol. 33, No. 3, p. 5, 1977. Besser, "Modular Concrete Block", publication, pp. 18-19, 1984. "Paving Stone", publication, Jun. 1984. Besser Company Bulletin, Feb. 1985.
Patent History
Patent number: D316904
Type: Grant
Filed: Nov 21, 1988
Date of Patent: May 14, 1991
Inventor: Paul J. Forsberg (Edina, MN)
Primary Examiner: A. Hugo Word
Assistant Examiner: Doris Clark
Law Firm: Burd, Bartz & Gutenkauf
Application Number: 7/273,874
Classifications