| 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 |