Issued Patents All Time
Showing 26–50 of 71 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4639750 | Fluoran compounds and marking systems | Edward E. Ehlinger | 1987-01-27 |
| 4636820 | Compositions, process and systems | Paul Schmidt | 1987-01-13 |
| 4632783 | Triphenylmethane dyestuffs | Patrick J. Jefferies | 1986-12-30 |
| 4618684 | Substituted indoles | Paul Schmidt | 1986-10-21 |
| 4604458 | 3-substituted carbonyloxy-7-disubstituted amino-10-substituted carbonylphenothiazines | — | 1986-08-05 |
| 4604461 | 5-substituted-9-disubstituted amino-12-substituted carbonylbenzo[a]phenoxazines | — | 1986-08-05 |
| 4604462 | 4-substituted amido-8-disubstituted aminoimidazophenoxazines | — | 1986-08-05 |
| 4595536 | Triphenylmethane dyestuff | Jack M. Knox | 1986-06-17 |
| 4570171 | Electrochromic marking systems | — | 1986-02-11 |
| 4561001 | Electrochromic marking systems | Michael B. Gunn | 1985-12-24 |
| 4558137 | Bis phenyl (2 carboxylic acid or ester indol-3-yl)methanes | Paul Schmidt | 1985-12-10 |
| 4551740 | Electrochromic and marking systems | — | 1985-11-05 |
| 4549192 | Electrochromic marking systems | — | 1985-10-22 |
| 4540790 | Certain 4-substituted-2,6-bis(heteroaryl)pyridines | Paul Schmidt | 1985-09-10 |
| 4539579 | Compounds, processes and marking systems | Paul Schmidt | 1985-09-03 |
| 4536367 | Method for sanitizing toilets | Patrick J. Jefferies | 1985-08-20 |
| 4536368 | Method for sanitizing toilets | Jack M. Knox | 1985-08-20 |
| 4535172 | 3(Ether and thioether) 3-(4-dialkylaminophenyl) phthalides | Paul Schmidt | 1985-08-13 |
| 4515971 | 5'/6'-Carboxyfluorans and derivatives thereof | Paul Schmidt | 1985-05-07 |
| 4507483 | 3-[(Substituted-amino)(thienyl)methyl]-1H-indoles | Paul Schmidt | 1985-03-26 |
| 4494989 | Compounds, processes and marking systems | Paul Schmidt | 1985-01-22 |
| 4485242 | 3[(Alkoxy)(4-aminophenyl, 1-naphthyl or 1-biphenylyl)methyl]1H-indoles | Paul Schmidt | 1984-11-27 |
| 4447616 | Pyridine containing benzoic acid derivatives | Edward E. Ehlinger | 1984-05-08 |
| 4446321 | 4-Aryl-bis 2,6-(aminophenyl)pyridines | Paul Schmidt | 1984-05-01 |
| 4431819 | 3-(Pyrrolo and 3-indolyl)-3-diphenylamino substituted phthalides | Paul Schmidt | 1984-02-14 |