Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6250345 | Secondary containment and drainage system for above-ground storage tanks | Steven P. Allwein | 2001-06-26 |
| 6056137 | Retrofit underground storage tank and method for making the same | Edward B. Cannan, Jr., Michael Blackmar, Edgar Clifford Crosby, III, Larry D. Lumpkin, John C. King | 2000-05-02 |
| 5816424 | Retrofit underground storage tank | Edward B. Cannan, Jr., Michael Blackmar, Edgar Clifford Crosby, III, Larry D. Lumpkin, John C. King +1 more | 1998-10-06 |