Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8307490 | Multifunction caulk tool | Donald Gringer, Yuan Fang Cheng | 2012-11-13 |
| D634600 | Caulk tool | Donald Gringer, Yuan Fang Cheng | 2011-03-22 |
| 7226205 | Fluid mixing device | Donald Gringer, Yuan Fang Cheng | 2007-06-05 |
| D537591 | Soft boot for glass scraper | Donald Gringer, Yuan Fang Cheng | 2007-02-27 |
| D516263 | Soft boot for glass scraper | Donald Gringer, Yuan Fang Cheng | 2006-02-28 |
| 6971788 | Fluid mixing device | Donald Gringer, Yuan Fang Cheng | 2005-12-06 |
| D364955 | Tool and parts holder | Donald Gringer | 1995-12-12 |
| 4516360 | Molded pole-type sandpapering tool having resilient paper retention means | Donald Gringer | 1985-05-14 |