| Classification | Number | Url | PMD | Priority | Assignee | Assignee Loc | Inventor(s) | Inventor Loc(s) | Filing Date | Issued Date |
| classification-0 | 5,380,445 | Pretreatment of microbial sludges | 5,380,445 | No | Midwest Research Institute | Kansas City, MO | Rivard; Christopher J.:Nagle; Nicholas J. | Lakewood, CO:Louisville, CO | October 22, 1993 | January 10, 1995 |