Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9092916 | Lock-out, tag-out system using safety programmable logic controller | — | 2015-07-28 |
| 8810991 | Safety isolation systems and methods for switching DC loads | — | 2014-08-19 |
| 8688247 | Lock-out, tag-out system using safety programmable logic controller | — | 2014-04-01 |
| 8643225 | Lock-out, tag-out system using safety network | — | 2014-02-04 |
| 8188621 | Apparatus and method for restricting power delivery | Stephen Zbytowski | 2012-05-29 |
| 7928330 | Safety switch | Julian Poyner, David Williams, Gillian P Parker, David Howard Kerr, Derek W. Jones +4 more | 2011-04-19 |
| 7868487 | Apparatus and method for restricting power delivery | Stephen Zbytowski | 2011-01-11 |
| 7675200 | Combination control system with intermediate module | — | 2010-03-09 |
| 7610107 | Control system having verification module | Stephen Zbytowski | 2009-10-27 |
| 7420297 | Combination control system with intermediate module | — | 2008-09-02 |
| 6130488 | Switching filter producing a low impedance control input on a high impedance input line for discriminating false control signals | James E. Hansen, Thomas A. Wilsdon | 2000-10-10 |
| 5510951 | Electronic control for 3-wire DC coils | Gunars Briedis, Jerome K. Hastings | 1996-04-23 |
| 5222009 | Solid state overload relay | Gary Mayer | 1993-06-22 |