Werner Pieper
18Patents
4h-index
19Co-inventors
57Inventor score
Filing activity: Jan 23, 1981 → Nov 21, 2012
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4504021A | Ribbon free wound yarn package and method and apparatus for producing the same | Performing Operations; Transporting | 20 | Expired |
| US8333832B2 | Pigment preparation and ink jet printing ink | Emerging Cross-Sectional Technologies | 6 | Active |
| US4507249A | Process for making derivatives of vinylphosphonic acid or vinylpyrophosphonic acid | Chemistry; Metallurgy | 4 | Expired |
| US4347989A | Spinning machine for synthetic threads | Performing Operations; Transporting | 4 | Expired |
| US4486357A | Process for making vinylphosphonic acid or vinylpyrophosphonic acid | Chemistry; Metallurgy | 4 | Expired |
| US4525333A | Process for separating gallium and indium from aqueous solutions | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4529559A | Process for making derivatives of vinylphosphonic acid or vinylpyrophosphonic acid | Chemistry; Metallurgy | 2 | Expired |
| US4473509A | Process for making phosphonic anhydrides | Chemistry; Metallurgy | 2 | Expired |
| US4645835A | Process for making chloroisocyanuric acids | Chemistry; Metallurgy | 1 | Expired |
| US4692282A | Phenyltetraline-diphosphonic acids and process for making them | Chemistry; Metallurgy | 1 | Expired |
| US4735748A | Process for making phosphonic acid dichlorides | Chemistry; Metallurgy | 1 | Expired |
| US4468355A | Process for making 1-hydroxy-alkane-1-phosphonic acids | Chemistry; Metallurgy | 1 | Expired |
| US4692281A | Carboxytetralinephosphonic acids and process for making them | Chemistry; Metallurgy | 0 | Expired |
| US5122359A | Process for reprocessing sulfuric acid from phosphorous purification | Chemistry; Metallurgy | 0 | Expired |
| US5213717A | Apparatus for fumigating waste waters | Emerging Cross-Sectional Technologies | 0 | Expired |
| US4587334A | Process for making cyanuric acid | Chemistry; Metallurgy | 0 | Expired |
| US8608843B2 | Pigment preparation and ink jet printing ink | Emerging Cross-Sectional Technologies | 0 | Active |
| US4427603A | Process for making phosphonic acid ester chlorides | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.