Pennwalt Corporation
616Patents
0Active
616Granted
45Portfolio score
Filing activity: Jun 6, 1963 → Sep 22, 1989
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4725204A | Vacuum manifold pumping system | Chemistry; Metallurgy | 347 | Expired |
| US4221778A | Prolonged release pharmaceutical preparations | Human Necessities | 194 | Expired |
| US4161949A | Aseptic connector | Emerging Cross-Sectional Technologies | 171 | Expired |
| US4904222A | Synchronized sound producing amusement device | Emerging Cross-Sectional Technologies | 130 | Expired |
| US4166602A | Counterbalancing mechanism for X-ray tubeheads | Mechanical Engineering; Lighting; Heating | 127 | Expired |
| US4504402A | Encapsulated phase change thermal energy _storage materials | Emerging Cross-Sectional Technologies | 98 | Expired |
| US4687107A | Apparatus for sizing and sorting articles | Emerging Cross-Sectional Technologies | 96 | Expired |
| US4931019A | Electrostatic image display apparatus | Performing Operations; Transporting | 92 | Expired |
| US4424045A | Rigid high speed flexible shaft casing assembly for tight radii installations | Mechanical Engineering; Lighting; Heating | 92 | Expired |
| US4843275A | Air buoyant piezoelectric polymeric film microphone | Emerging Cross-Sectional Technologies | 79 | Expired |
| US4205060A | Microcapsules containing medicament-polymer salt having a water-insoluble polymer sheath, their production and their use | Emerging Cross-Sectional Technologies | 71 | Expired |
| US4726898A | Apparatus for spinning fruit for sorting thereof | Emerging Cross-Sectional Technologies | 70 | Expired |
| US4638207A | Piezoelectric polymeric film balloon speaker | Emerging Cross-Sectional Technologies | 70 | Expired |
| US4870868A | Vibration sensing apparatus | Physics | 67 | Expired |
| US4762709A | Liquid prolonged release pharmaceutical formulations containing ionic constituents | Human Necessities | 67 | Expired |
| US3969258A | Low foaming acid-anionic surfactant sanitizer compositions | Chemistry; Metallurgy | 66 | Expired |
| US4513053A | Encapsulated phase change thermal energy storage materials and process | Emerging Cross-Sectional Technologies | 66 | Expired |
| US4505953A | Method for preparing encapsulated phase change materials | Emerging Cross-Sectional Technologies | 64 | Expired |
| US4240605A | Jig assembly for preparing dental impressions for casting | Human Necessities | 60 | Expired |
| US4569978A | Emulsion polymerization of vinylidene fluoride polymers in the presence of trichlorofluoromethane as chain transfer agent | Chemistry; Metallurgy | 58 | Expired |
| US3954648A | Coatings removal composition containing an alkali metal hydroxide, an oxygenated organic solvent, and an amine | Chemistry; Metallurgy | 57 | Expired |
| US4384047A | Porous vinylidene fluoride polymer membrane and process for its preparation | Performing Operations; Transporting | 55 | Expired |
| US4316448A | Solar energy concentrator system | Emerging Cross-Sectional Technologies | 55 | Expired |
| US4770527A | Photoelectric-piezoelectric velocity and impact sensor | Human Necessities | 54 | Expired |
| US4210749A | Substituted 1,2,4,5-tetrahydro-3H,3 benzazepines | Chemistry; Metallurgy | 54 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.