Square D Company
1,014Patents
22Active
1,014Granted
48Portfolio score
Filing activity: Feb 15, 1974 → May 20, 2009 · 22 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5440644A | Audio distribution system having programmable zoning features | Electricity | 1,509 | Expired |
| US4996646A | Microprocessor-controlled circuit breaker and system | Emerging Cross-Sectional Technologies | 385 | Expired |
| US4984155A | Order entry system having catalog assistance | Physics | 354 | Expired |
| US5982645A | Power conversion and distribution system | Electricity | 277 | Expired |
| US5151978A | LAN interface which permits a host computer to obtain data without interrupting a ladder program executing in the interface | Physics | 242 | Expired |
| US5611059A | Prelinked parameter configuration, automatic graphical linking, and distributed database configuration for devices within an automated monitoring/control system | Physics | 205 | Expired |
| US7183667B2 | Method and apparatus for power inverter synchronization | Electricity | 185 | Expired |
| US6813525B2 | Energy management system | Emerging Cross-Sectional Technologies | 184 | Expired |
| US5465011A | Uninterruptible power supply with improved output regulation | Electricity | 147 | Expired |
| US5847913A | Trip indicators for circuit protection devices | Electricity | 146 | Expired |
| US5185705A | Circuit breaker having serial data communications | Emerging Cross-Sectional Technologies | 141 | Expired |
| US5159673A | Apparatus for networking programmable logic controllers to host computers | Electricity | 132 | Expired |
| US6009406A | Methodology and computer-based tools for re-engineering a custom-engineered product line | Physics | 132 | Expired |
| US5245704A | System for sharing data between microprocessor based devices | Physics | 127 | Expired |
| US6141192A | Arcing fault protection system for a switchgear enclosure | Electricity | 127 | Expired |
| US5131092A | Communication system enabling programmable logic controllers access to host computer tasks and host computer access to programmable logic controllers without polling | Physics | 118 | Expired |
| US5748616A | Data link module for time division multiplexing control systems | Electricity | 109 | Expired |
| US5682101A | Arcing fault detection system | Electricity | 107 | Expired |
| US5166887A | Microcomputer-controlled circuit breaker system | Emerging Cross-Sectional Technologies | 105 | Expired |
| US5358135A | Access door hinge attachment | Electricity | 103 | Expired |
| US5023396A | Pop-up service fitting | Electricity | 103 | Expired |
| US5233538A | Waveform capturing arrangement in a distributed power network | Emerging Cross-Sectional Technologies | 102 | Expired |
| US5224054A | Waveform capturing arrangement in distributed power network | Emerging Cross-Sectional Technologies | 101 | Expired |
| US4349220A | Raintight wireway | Electricity | 98 | Expired |
| US4897777A | Peer-to-peer register exchange controller for PLCS | Physics | 97 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.