Flexsys America L.P.
29Patents
4Active
29Granted
34Portfolio score
Filing activity: May 5, 1995 → Aug 26, 2020 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5608111A | Method of preparing 4-aminodiphenylamine | Chemistry; Metallurgy | 27 | Expired |
| US6184276A | Quinone diimine as a rubber additive | Chemistry; Metallurgy | 19 | Expired |
| US5623088A | Method of preparing 4-aminodiphenylamine | Chemistry; Metallurgy | 17 | Expired |
| US6495723B1 | Zeolite support loaded with a base material for use in the coupling of aniline and nitrobenzene | Performing Operations; Transporting | 16 | Expired |
| US6140538A | Process for preparing 4-aminodiphenylamines | Chemistry; Metallurgy | 15 | Expired |
| US6395933B1 | Process for preparing 4-aminodiphenylamine intermediates | Chemistry; Metallurgy | 13 | Expired |
| US6583320B2 | Process for preparing 4-aminodiphenylamine intermediates | Chemistry; Metallurgy | 13 | Expired |
| US6114469A | Rubber compositions containing zinc hexasulfide complexes | Chemistry; Metallurgy | 11 | Expired |
| US5977411A | Catalytic hydrogeneration of nitrobenzene to 4-aminodiphenylamine in the presence of a hydroxyl compound and a solvent | Chemistry; Metallurgy | 11 | Expired |
| US5633407A | Process for preparing substituted aromatic amines | Chemistry; Metallurgy | 9 | Expired |
| US6420581B1 | Manufacture of zinc hexasulfide amine complexes | Chemistry; Metallurgy | 7 | Expired |
| US6646029B1 | Pyrimidine derivatives as hardness stabilizers | Chemistry; Metallurgy | 4 | Expired |
| US6271420A | Preparation of quinonediimines from phenylenediamines using hydrogen peroxide and a catalyst | Chemistry; Metallurgy | 4 | Expired |
| US5959126A | Formation of quinonedimines from phenylenediamines by catalytic oxidation | Chemistry; Metallurgy | 3 | Expired |
| US7183439B2 | Process for preparing 4-aminodiphenylamine intermediates | Chemistry; Metallurgy | 3 | Expired |
| US6465604B2 | Pyrimidine derivatives as hardness stabilizers | Chemistry; Metallurgy | 3 | Expired |
| US6187937A | Preparation of N-phenyl-benzoquinoneimine from hydroxydiphenylamines | Chemistry; Metallurgy | 2 | Expired |
| US6025508A | Preparation of quinonediimines from phenylenediamines using oxygen and a metal or metal salt catalyst | Chemistry; Metallurgy | 1 | Expired |
| US6114554A | Preparation of quinonediimines from phenylenediamines using a hypochlorite as an oxidation agent | Chemistry; Metallurgy | 1 | Expired |
| US6533859B2 | Surface treated carbon black having improved dispersability in rubber and compositions of rubber therefrom having improved processability, rheological and dynamic mechanical properties | Chemistry; Metallurgy | 1 | Expired |
| US6043384A | Preparation of quinoneimines from hydroxyphenylamines using hydrogen peroxide and a catalyst | Chemistry; Metallurgy | 1 | Expired |
| US11905256B2 | Triazinanes and methods of making them | Chemistry; Metallurgy | 1 | Active |
| US6072061A | Preparation of quinoneimines from hydroxyphenylamines using a hypochlorite as an oxidation agent | Chemistry; Metallurgy | 1 | Expired |
| US8207247B2 | Processes for preparing rubber blend compositions | Chemistry; Metallurgy | 1 | Active |
| US7504539B2 | Process for preparing 4-aminodiphenylamine intermediates | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.