Metropolitan Industries, Inc.
42Patents
25Active
42Granted
49Portfolio score
Filing activity: Apr 17, 1975 → May 9, 2022 · 7 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5522707A | Variable frequency drive system for fluid delivery system | Emerging Cross-Sectional Technologies | 82 | Expired |
| US7307538B2 | Pump connector system | Mechanical Engineering; Lighting; Heating | 80 | Expired |
| US6789024B1 | Flow calculation system | Physics | 79 | Expired |
| US6257833A | Redundant, dedicated variable speed drive system | Mechanical Engineering; Lighting; Heating | 77 | Expired |
| US6847130B1 | Uninterruptible power system | Emerging Cross-Sectional Technologies | 70 | Expired |
| US7612529B2 | Pump control with multiple rechargeable battery docking stations | Electricity | 63 | Active |
| US6366053B1 | DC pump control system | Electricity | 62 | Expired |
| US6198257A | Transformerless DC-to-AC power converter and method | Emerging Cross-Sectional Technologies | 62 | Expired |
| US6150776A | Variable frequency motor starting system and method | Electricity | 48 | Expired |
| US3965635A | Prefabricated building panel and method of making | Fixed Constructions | 37 | Expired |
| US4031682A | Prefabricated building panel and method of making | Fixed Constructions | 30 | Expired |
| US6322325A | Processor based pump control systems | Mechanical Engineering; Lighting; Heating | 30 | Expired |
| US6565325B2 | Processor based pump control systems | Mechanical Engineering; Lighting; Heating | 29 | Expired |
| US5973501A | Current and voltage probe for measuring harmonic distortion | Physics | 29 | Expired |
| US6014027A | Current and voltage probe for measuring harmonic distortion | Physics | 27 | Expired |
| US5707211A | Variable speed pump system with a hydropneumatic buffer/pressure tank | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US8907789B2 | Pump control unit | Mechanical Engineering; Lighting; Heating | 22 | Active |
| US8226371B2 | Pump control unit with decelerometer switch | Mechanical Engineering; Lighting; Heating | 21 | Active |
| US8591198B2 | Strain gauge pump control switch | Mechanical Engineering; Lighting; Heating | 18 | Active |
| US6356467B1 | DC/DC boost converter with bypass circuitry | Electricity | 16 | Expired |
| US8186975B2 | Low profile pump with first and second rotor arrangement | Mechanical Engineering; Lighting; Heating | 15 | Active |
| US8180496B2 | System and method of constant pressure, variable speed pump control with local equalization for dissimilar pumps | Mechanical Engineering; Lighting; Heating | 13 | Active |
| US8149122B2 | Liquid level detection system with floating RFID tag | Physics | 12 | Active |
| US6647664B1 | Hanger for a housing | Fixed Constructions | 5 | Expired |
| US7615954B1 | Density sensing, solid state, pump switching system | Physics | 4 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.