Patent Grant
D428499
| Number | Name | Date | Kind |
|---|---|---|---|
| 14052 | Conkling | Jan 1856 | |
| D33317 | Lafferty | Oct 1900 | |
| 225945 | Perchment | Mar 1880 | |
| D317209 | Forsberg | May 1991 | |
| D319885 | Blomquist et al. | Sep 1991 | |
| D321060 | Blomquist et al. | Oct 1991 | |
| D340996 | Woolbright | Nov 1993 | |
| D359367 | Ciccarello et al. | Jun 1995 | |
| D362511 | Anderson et al. | Sep 1995 | |
| D380560 | Forsberg | Jul 1997 | |
| D381086 | Forsberg | Jul 1997 | |
| 722712 | Jasper | Mar 1903 | |
| 741040 | Jones | Oct 1903 | |
| 762193 | Porten | Jun 1904 | |
| 762251 | Porten | Jun 1904 | |
| 852578 | Rounds | May 1907 | |
| 1394406 | Calvert | Oct 1921 | |
| 1400893 | Martin | Dec 1921 | |
| 1412666 | Mixon | Apr 1922 | |
| 1542909 | Regan | Jun 1925 | |
| 1592476 | Torrecelli | Jul 1926 | |
| 1794060 | Brozek | Feb 1931 | |
| 1798331 | Liptak | Mar 1931 | |
| 1855987 | Rammar | Apr 1932 | |
| 1865114 | Kissinger | Jun 1932 | |
| 2313363 | Schmitt | Mar 1943 | |
| 4340360 | Hoedl et al. | Jul 1982 | |
| 4543893 | Kunnecke | Oct 1985 | |
| 5062610 | Woolford et al. | Nov 1991 | |
| 5161918 | Hodel | Nov 1992 | |
| 5214898 | Beretta | Jun 1993 | |
| 5294216 | Sievert | Mar 1994 | |
| 5353569 | Rodrique | Oct 1994 | |
| 5361557 | Snyder et al. | Nov 1994 | |
| 5540525 | Miller et al. | Jul 1996 | |
| 5589124 | Woolford et al. | Dec 1996 | |
| 5595460 | Miller et al. | Jan 1997 | |
| 5598679 | Orton et al. | Feb 1997 | |
| 5619835 | Bailey, II et al. | Apr 1997 | |
| 5673530 | Bailey, II | Oct 1997 | |
| 5827015 | Woolford et al. | Oct 1998 |
| Number | Date | Country |
|---|---|---|
| 171859 | Jul 1952 | ATX |
| 371000 | Feb 1907 | FRX |
| 1438181 | Apr 1966 | FRX |
| 2259654 | Dec 1972 | DEX |
| 239016 | Sep 1986 | DEX |
| 1438926 | Jun 1976 | GBX |
| Entry |
|---|
| Gordon Schmidt, "The Story Of Concrete . . . ", concrete block illustrated, Concrete, Dec. 1958, p. 26. |
