Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8696275 | Creep limiting direct tension indicating washer | Jordan David Richardson | 2014-04-15 |
| 8382409 | Direct tension multi-color indicating washers | — | 2013-02-26 |
| 8002641 | Method of making direct tension indicating washers | — | 2011-08-23 |
| 7857562 | Direct tension indicating washer having enhanced emission of indicating material | — | 2010-12-28 |
| 6729819 | Bolt lubricating device and method | — | 2004-05-04 |
| 6425718 | Direct multi-tension indicating washer having bumps of a first and second height | John A. Herr | 2002-07-30 |
| 6152665 | Direct tension indicating washers | John A. Herr | 2000-11-28 |
| 5931618 | Direct tension indicating washers | John A. Herr | 1999-08-03 |
| 5769581 | Direct tension indicating washers | John A. Herr | 1998-06-23 |