Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5755982 | Concrete casting system | Arthur Sherrer, Robert L. Murphy | 1998-05-26 |
| 5540411 | Invert former for manhole base section | — | 1996-07-30 |
| 5383311 | Lined structure and liner | — | 1995-01-24 |
| 5303518 | Lined manhole assembly and liner | — | 1994-04-19 |
| 5230907 | Inside corner form | — | 1993-07-27 |
| 4614326 | Concrete mold core assembly | H. Grady Ivey | 1986-09-30 |
| 4570896 | Slide action inside corner form | H. Grady Ivey | 1986-02-18 |
| 4519570 | Inside corner concrete form unit | H. Grady Ivey | 1985-05-28 |
| 4333289 | Concrete form support structure | — | 1982-06-08 |
| 4231541 | Concrete form panel tying apparatus | — | 1980-11-04 |
| 4219180 | Tying apparatus for concrete form panel | — | 1980-08-26 |