Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7921720 | Dial-type flow-restriction gauges | H. Dianne Hammerand | 2011-04-12 |
| 7777143 | Non-locking switch for filter monitoring | Joseph P. Heuthorst, Michael J. Lockert | 2010-08-17 |
| 7562579 | Dial-type flow-restriction gauges | H. Dianne Hammerand | 2009-07-21 |
| 7470360 | Fluid flow restriction indicator | H Dianne Hammerand | 2008-12-30 |
| 7414207 | Non-locking switch for filter monitoring | Joseph P. Heuthorst, Michael J. Lockert | 2008-08-19 |
| 6327902 | Air filter restriction indicator gauge | Gregory Matthew Ferris | 2001-12-11 |
| 5850183 | Air filter restriction indicating device | — | 1998-12-15 |
| 5774056 | Gauge for monitoring air filters | Jerry Lee Manross, Thomas Alan Stoll, Gregory Matthew Ferris, James Nathan Forry | 1998-06-30 |
| 4580334 | Method for manufacturing a commutator | William T. McCracken, Richard S. McClaughry, III | 1986-04-08 |