Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5640738 | Wet and dry vacuum cleaner | William H. Williams | 1997-06-24 |
| 5526547 | Wet and dry vacuum cleaner | William H. Williams | 1996-06-18 |
| 5347678 | Head assembly for a vacuum cleaning apparatus having dual-individually floating heads | William H. Williams | 1994-09-20 |
| 5189757 | Head assembly for a vacuum cleaning apparatus | William H. Williams | 1993-03-02 |
| 5067584 | Low cost replaceable type sound dampening unit for vacuum cleaning machine | William H. Williams | 1991-11-26 |
| 5054158 | Scrubbing machine/vacuum cleaner | William H. Williams | 1991-10-08 |
| 5030068 | Vibration and shock damping air blower | William H. Williams | 1991-07-09 |
| 5012549 | Side loading dual pail wet vacuum with flow divider | William H. Williams | 1991-05-07 |
| D313095 | Power carpet cleaner | Bonifacio N. Avecilla | 1990-12-18 |
| 4809397 | Rug and carpet cleaner | Bonifacio N. Avecilla, Norman Lapworth | 1989-03-07 |
| D298479 | Portable machine for wet or dry vacuum extraction | Bonifacio N. Avecilla, Norman Lapworth | 1988-11-08 |
| 4463474 | Vacuum cleaner | — | 1984-08-07 |
| D264591 | Wet and dry vacuum cleaner | — | 1982-05-25 |
| 4287635 | Wet and dry vacuum cleaner | — | 1981-09-08 |