PQ Corporation
115Patents
28Active
115Granted
47Portfolio score
Filing activity: Mar 21, 1977 → Feb 7, 2022 · 8 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4420442A | Manufacturing process for hollow microspheres | Emerging Cross-Sectional Technologies | 134 | Expired |
| US4421562A | Manufacturing process for hollow microspheres | Emerging Cross-Sectional Technologies | 100 | Expired |
| US4540629A | Hollow microspheres with organosilicon-silicate walls | Emerging Cross-Sectional Technologies | 96 | Expired |
| US5534348A | Hollow borosilicate microspheres and method of making | Emerging Cross-Sectional Technologies | 80 | Expired |
| US5601798A | Process for preparing zeolite Y with increased mesopore volume | Emerging Cross-Sectional Technologies | 66 | Expired |
| US4626550A | Zeolite for personal care products | Human Necessities | 58 | Expired |
| US4379143A | Topical liquid or ointment | Human Necessities | 56 | Expired |
| US5391385A | Method of frying oil treatment using an alumina and amorphous silica composition | Chemistry; Metallurgy | 54 | Expired |
| US4752341A | Pigment system for paper | Textiles; Paper | 50 | Expired |
| US4117105A | Process for preparing dispersible boehmite alumina | Chemistry; Metallurgy | 42 | Expired |
| US6248911A | Process and composition for refining oils using metal-substituted silica xerogels | Chemistry; Metallurgy | 40 | Expired |
| US4216125A | Detergent compositions with silane-zeolite silicate builder | Chemistry; Metallurgy | 33 | Expired |
| US4340642A | Surface modified hollow microspheres | Emerging Cross-Sectional Technologies | 33 | Expired |
| US4411847A | Process for surface modified hollow microspheres | Emerging Cross-Sectional Technologies | 26 | Expired |
| US4362715A | Cosmetic vehicle | Human Necessities | 22 | Expired |
| US4508742A | Treating beer to prevent chill haze and metal contamination | Chemistry; Metallurgy | 20 | Expired |
| US4138363A | Silane-zeolite compositions | Chemistry; Metallurgy | 20 | Expired |
| US6001764A | Olefin polymerization catalysts with specific silica supports | Chemistry; Metallurgy | 19 | Expired |
| US7645718B2 | Microporous crystalline material comprising a molecular sieve or zeolite having an 8-ring pore opening structure and methods of making and using same | Performing Operations; Transporting | 19 | Active |
| US4349533A | Toothpaste containing pH-adjusted zeolite | Human Necessities | 17 | Expired |
| US4636394A | Method and compositions for chillproofing beverages | Chemistry; Metallurgy | 16 | Expired |
| US5409980A | Flame retardant compositions | Chemistry; Metallurgy | 16 | Expired |
| US4347890A | Method for binding particulate materials | Chemistry; Metallurgy | 16 | Expired |
| US4528276A | Zeolite ion exchanger for builders in detergents | Chemistry; Metallurgy | 13 | Expired |
| US5895770A | Olefin polymerization catalysts with specific silica supports | Chemistry; Metallurgy | 13 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.