VTech Communications, Ltd.
64Patents
3Active
64Granted
37Portfolio score
Filing activity: Jun 1, 1994 → Jun 24, 2011 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5710815A | Encoder apparatus and decoder apparatus for a television signal having embedded viewer access control data | Electricity | 201 | Expired |
| US6667738B2 | Touch screen overlay apparatus | Electricity | 183 | Expired |
| USD460446S1 | Auxiliary telephone base | General | 47 | Expired |
| US5497125A | Current sense circuit apparatus for power amplifier control | Electricity | 44 | Expired |
| USD456795S1 | Telephone base | General | 34 | Expired |
| US5578875A | Dual battery recharger with backup power feature for use in systems having a base unit and battery-powered portable unit | Electricity | 33 | Expired |
| US5995554A | Data framing format for digital radio communications and method of forming same | Electricity | 29 | Expired |
| US5619553A | Method of conducting an intercom communication between two cordless telephone handsets | Electricity | 23 | Expired |
| US7136929B2 | Broadcast in a wireless communications system | Electricity | 22 | Expired |
| US5586141A | Interface protocol method for use in a frequency hopping radio system having first hopping code for synchronization and second hopping code for communication | Electricity | 21 | Expired |
| USD460059S1 | Telephone handset | General | 18 | Expired |
| USD369803S | Cordless telephone base housing | General | 18 | Expired |
| USD384079S | Telephone handset housing | General | 16 | Expired |
| US5956377A | Method and apparatus for synchronizing frames within a continuous stream of digital data | Electricity | 16 | Expired |
| USD412170S | Telephone handset | General | 15 | Expired |
| USD439887S | Telephone handset | General | 15 | Expired |
| USD472538S1 | Telephone base | General | 15 | Expired |
| USD401931S | Telephone handset housing | General | 15 | Expired |
| US7103030B2 | Adaptive frequency hopping strategy | Electricity | 15 | Expired |
| US5510697A | Low drop-out voltage regulator apparatus | Physics | 15 | Expired |
| USD408405S | Telephone handset | General | 14 | Expired |
| USD422587S | Telephone handset housing | General | 14 | Expired |
| USD469075S1 | Telephone handset and base | General | 14 | Expired |
| USD369799S | Cordless telephone base housing | General | 13 | Expired |
| USD369798S | Cordless telephone base housing | General | 13 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.