Helmut Waldmann
68Patents
10h-index
75Co-inventors
81Inventor score
Filing activity: Dec 27, 1972 → Oct 31, 1997
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5369947A | Process for converting plastic waste into power | Emerging Cross-Sectional Technologies | 42 | Expired |
| US4294703A | Hydrogen peroxide treatment of effluent | Chemistry; Metallurgy | 35 | Expired |
| US4321143A | Treating effluent with peroxide and iron | Chemistry; Metallurgy | 27 | Expired |
| US4113747A | Process for the preparation of propylene oxide | Chemistry; Metallurgy | 14 | Expired |
| US4370275A | Process for the preparation of carbonic acid esters | Performing Operations; Transporting | 13 | Expired |
| US5210328A | Process for the preparation of substituted cycloalkylidene bisphenols | Chemistry; Metallurgy | 11 | Expired |
| US4369096A | Process for the purification of epoxides | Chemistry; Metallurgy | 10 | Expired |
| US4705843A | Process for the production of substituted polyaryl ethers | Chemistry; Metallurgy | 10 | Expired |
| US5322965A | Process for the preparation of a mixture of cyclohexylamine and dicyclohexylamine using a supported noble metal catalyst | Chemistry; Metallurgy | 10 | Expired |
| US5304525A | Catalyst for the preparation of aniline | Chemistry; Metallurgy | 10 | Expired |
| US4053523A | Process for the hydroxylation of phenol | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5599965A | Process for the preparation of dialky carbonates | Chemistry; Metallurgy | 9 | Expired |
| US4137242A | Process for the preparation of propylene oxide | Chemistry; Metallurgy | 9 | Expired |
| US4045496A | Process for the hydroxylation of phenols and phenol ethers in the nucleus | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6387345B1 | Process for working up reaction gases during the oxidation HCI to chlorine | Chemistry; Metallurgy | 8 | Expired |
| US5233072A | Process for the preparation of dialkyl carbonates | Chemistry; Metallurgy | 8 | Expired |
| US4324925A | Process for the preparation of polyhydric phenols | Chemistry; Metallurgy | 7 | Expired |
| US4582923A | Process for the production of urethanes | Chemistry; Metallurgy | 7 | Expired |
| US4341709A | Preparation of .epsilon.-caprolactone | Chemistry; Metallurgy | 7 | Expired |
| US4214105A | Process for the hydroxylation of phenol | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4360682A | Stabilizing caprolactones with dihydroxybenzenes | Chemistry; Metallurgy | 6 | Expired |
| US5196592A | Process for the preparation of diphenylamines | Chemistry; Metallurgy | 6 | Expired |
| US4087455A | Process for the continuous preparation of percarboxylic acids in organic solutions | Emerging Cross-Sectional Technologies | 6 | Expired |
| US5801285A | Process for the preparation of 2-methyl-2,4-diaminopentane | Chemistry; Metallurgy | 5 | Expired |
| US4059619A | Process for the preparation of percarboxylic acid solutions | Chemistry; Metallurgy | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.