Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6623914 | Method for preparing an acid salt of p-phenylenediamine-type photographic color developers | Phillip Montgomery Hudnall | 2003-09-23 |
| 6551767 | Process for preparing p-phenylenediamine color developers in a concentrated free-base form | Renee Ellen Niziurski-Mann, Phillip Montgomery Hudnall, Michael Wayne Salyer | 2003-04-22 |
| 6492099 | Method for purifying free-base p-phenylenediamine-type photographic color developers | Phillip Montgomery Hudnall | 2002-12-10 |
| 6271424 | Process for the purification of monotertiarybutyl hydroquinone | Phillip Montgomery Hudnall | 2001-08-07 |