PARTICLE MEASURING SYSTEMS, INC.
92Patents
56Active
92Granted
56Portfolio score
Filing activity: Jul 22, 1974 → Jan 23, 2024 · 8 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7667839B2 | Aerosol particle sensor with axial fan | Physics | 308 | Expired |
| US4893932A | Surface analysis system and method | Physics | 111 | Expired |
| US4636075A | Particle measurement utilizing orthogonally polarized components of a laser beam | Physics | 101 | Expired |
| US6167107A | Air pump for particle sensing using regenerative fan, and associated methods | Physics | 94 | Expired |
| US4798465A | Particle size detection device having high sensitivity in high molecular scattering environment | Physics | 89 | Expired |
| US5903338A | Condensation nucleus counter using mixing and cooling | Physics | 83 | Expired |
| US6903818B2 | Low noise intracavity laser particle counter | Physics | 80 | Expired |
| US4728190A | Device and method for optically detecting particles in a fluid | Physics | 79 | Expired |
| US5282151A | Submicron diameter particle detection utilizing high density array | Physics | 75 | Expired |
| US4893928A | Highly sensitive particle size detection device having noise cancellation | Physics | 73 | Expired |
| US6859277B2 | Particle counter with strip laser diode | Physics | 71 | Expired |
| US6246474A | Method and apparatus for measurement of particle size distribution in substantially opaque slurries | Human Necessities | 68 | Expired |
| US5751422A | In-situ particle detection utilizing optical coupling | Physics | 68 | Expired |
| US4594715A | Laser with stabilized external passive cavity | Physics | 65 | Expired |
| US7208123B2 | Molecular contamination monitoring system and method | Emerging Cross-Sectional Technologies | 64 | Expired |
| US8154724B2 | Two-dimensional optical imaging methods and systems for particle detection | Physics | 63 | Active |
| US6275290A | Chemical mechanical planarization (CMP) slurry quality control process and particle size distribution measuring systems | Human Necessities | 63 | Expired |
| US8427642B2 | Two-dimensional optical imaging methods and systems for particle detection | Physics | 61 | Active |
| US7456960B2 | Particle counter with improved image sensor array | Physics | 61 | Expired |
| US5805281A | Noise reduction utilizing signal multiplication | Physics | 59 | Expired |
| US4571079A | Aerosol sampling device and method with improved sample flow characteristics | Physics | 58 | Expired |
| US7030980B1 | Diode pumped intracavity laser particle counter with improved reliability and reduced noise | Physics | 58 | Expired |
| US6615679B1 | Ensemble manifold, system and method for monitoring particles in clean environments | Physics | 58 | Expired |
| US5861950A | Particle detection system utilizing an inviscid flow-producing nozzle | Physics | 58 | Expired |
| US5671046A | Device and method for optically detecting particles in a free liquid stream | Physics | 57 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.