Block wall
Latest Keystone Retaining Wall Systems, Inc. Patents:
Description
FIG. 1 is a perspective view of a block wall according to my new design;
FIG. 2 is an enlarged front perspective view of a portion of the block wall of FIG. 1.
Referenced Cited
U.S. Patent Documents
Foreign Patent Documents
Other references
| 2882689 | April 1959 | Huch, Jr. et al. |
| 4016693 | April 12, 1977 | Warren |
| 4312606 | January 26, 1982 | Sarikelle |
| 4335549 | June 22, 1982 | Dean |
| 4496266 | January 29, 1985 | Ruekstuhl |
| 4658541 | April 21, 1987 | Haile |
| 1360872 | April 1964 | FRX |
| 336 | 1871 | GBX |
| 2127872 | April 1984 | GBX |
- Concrete Masonry Pictorial, vol. 33, No. 3, c. 1977, p. 5. The Besser Company brochure, "Modular Concrete Block", 1984. The Besser Company brochure, "Paving Stone", Jun., 1984.
Patent History
Patent number: D297767
Type: Grant
Filed: May 11, 1987
Date of Patent: Sep 20, 1988
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: 7/47,450
Type: Grant
Filed: May 11, 1987
Date of Patent: Sep 20, 1988
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: 7/47,450
Classifications
