Issued Patents All Time
Showing 1–24 of 24 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6357070 | Multi-function, battery-powered, rider cleaning machine | Daniel C. Venard, Christopher M. Knowlton | 2002-03-19 |
| 6220490 | Drinking vest | — | 2001-04-24 |
| 6073304 | Squeegee adjustment method and apparatus | Christopher M. Knowlton | 2000-06-13 |
| 5993563 | Combination of main scrubbing machine and attachment scrubbing machine | Timothy A. Strickland, Richard C. Brigman | 1999-11-30 |
| 5802665 | Floor cleaning apparatus with two brooms | Christopher M. Knowlton, Timothy A. Strickland | 1998-09-08 |
| 5742975 | Articulated floor scrubber | Christopher M. Knowlton | 1998-04-28 |
| D391697 | Articulated floor cleaner | Christopher M. Knowlton | 1998-03-03 |
| D382383 | Floor scrubber | Christopher M. Knowlton | 1997-08-12 |
| 5630246 | Floor cleaning apparatus with flap having wear indicator | Christopher M. Knowlton, Timothy A. Strickland | 1997-05-20 |
| 5628086 | Floor cleaning apparatus with squeegee mounting system | Christopher M. Knowlton | 1997-05-13 |
| 5611108 | Floor cleaning apparatus with slidable flap | Christopher M. Knowlton, Timothy A. Strickland | 1997-03-18 |
| 5608947 | Floor cleaning apparatus with pre-filter | Christopher M. Knowlton, Timothy A. Strickland | 1997-03-11 |
| D376227 | Floor sweeper | Christopher M. Knowlton | 1996-12-03 |
| 5555596 | Floor cleaning apparatus | Christopher M. Knowlton | 1996-09-17 |
| 5485653 | Floor cleaning apparatus | Christopher M. Knowlton, Timothy A. Strickland | 1996-01-23 |
| 5467500 | Steering mechanism for a cleaning vehicle | Christopher M. Knowlton | 1995-11-21 |
| 5455979 | Apparatus for monitoring cleaning element wear | Frederick M. Bores, Mark A. Betker | 1995-10-10 |
| 5346034 | Vehicle engine mounting system | Christopher M. Knowlton | 1994-09-13 |
| 5265300 | Floor scrubber | Christopher M. Knowlton | 1993-11-30 |
| D329311 | Sweeper vehicle | Christopher M. Knowlton | 1992-09-08 |
| 5137108 | Vehicle engine mounting system | Christopher M. Knowlton | 1992-08-11 |
| D291932 | Machine for floor sweeping and scrubbing | Christopher M. Knowlton | 1987-09-15 |
| 4518012 | Air damper assembly with movable blades | — | 1985-05-21 |
| 4419535 | Multi-cable conduit for floors and walls | — | 1983-12-06 |