Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5324627 | Tetra-alkylammonium phenylsulfonylacetate thermal-dye-bleach agents | Dian E. Stevenson, Mark P. Kirk, Sylvia A. Farnum, William C. Frank, Randall H. Helland +7 more | 1994-06-28 |
| 5314795 | Thermal-dye-bleach construction comprising a polymethine dye and a thermal carbanion-generating agent | Randall H. Helland, Sylvia A. Farnum, Mark P. Kirk, Roger A. Mader, Mark B. Mizen +6 more | 1994-05-24 |