| Patent Number |
Title Of Patent |
Date Issued |
| 6579060 |
Impeller and housing assembly with reduced noise and improved airflow |
June 17, 2003 |
| An impeller and housing assembly with reduced noise and improved airflow includes a volute, a shaft, a housing, a central axis, and an inlet port located along the central axis. An outlet port is located on a second axis spaced from the central axis. An exhaust passage extends from the o |
| 6171054 |
Impeller housing with reduced noise and improved airflow |
January 9, 2001 |
| An impeller housing for a suction device with reduced noise and improved airflow. The impeller assembly comprises a shaft and a housing. The housing comprises a volute, a central axis, and an inlet port located along the central axis. An outlet port is located on a second axis spaced |
| 6065347 |
Method and means for measuring dynamic and static air pressure on a ground surface beneath a neg |
May 23, 2000 |
| A method of measuring dynamic air pressure on a ground surface beneath a negative air system which is comprised of a rotatable negative air pressure element with a deck unit having a top with side walls and an open bottom involves placing the system on an elevated horizontal platform |
| 5929339 |
Method and means for measuring dynamic and static air pressure on a ground surface beneath a law |
July 27, 1999 |
| A method of measuring dynamic air pressure on a ground surface beneath a lawn mower system which is comprised of a rotatable horizontal blade with a deck unit having a closed top with side walls and an open bottom involves placing the mower on an elevated horizontal platform located in |
| 5737797 |
Central vacuum with acoustical damping |
April 14, 1998 |
| A central vacuum unit having an acoustic damping system is provided. The central vacuum unit includes a canister having a sidewall forming a hollow interior and a lid closing an end of the sidewall, a vacuum motor within the canister which emits noise during operation, at least one cooli |
