DDI, Inc.
32Patents
7Active
32Granted
41Portfolio score
Filing activity: Sep 29, 1995 → Nov 27, 2013 · 3 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6690928B1 | Mobile communication system for forecasting communication traffic | Electricity | 27 | Expired |
| US6615030B1 | Mobile communications system and radio base station apparatus | Electricity | 25 | Expired |
| US6961316B2 | Mobile communication system having adaptively assigned packet rate | Electricity | 21 | Expired |
| US6836484B2 | Wireless packet communication method and system for transmitting packets between base station and radio terminal station | Electricity | 20 | Expired |
| US6775478B2 | Optical TDM multiplexer, optical TDM demultiplexer, WDM/TDM converter and TDM/WDM converter | Electricity | 20 | Expired |
| US5902561A | Low temperature inert gas purifier | Chemistry; Metallurgy | 18 | Expired |
| US6898423B2 | Group communication system for mobile terminals having real time communication capabilities | Electricity | 17 | Expired |
| US7010585B2 | DNS server, DHCP server, terminal and communication system | Electricity | 14 | Expired |
| US5833738A | Specialty gas purification system | Performing Operations; Transporting | 13 | Expired |
| US7152063B2 | Scheme for filtering documents on network using relevant and non-relevant profiles | Emerging Cross-Sectional Technologies | 11 | Expired |
| US6785248B2 | Spread spectrum communication method and spread spectrum communication apparatus | Electricity | 11 | Expired |
| US8789653B2 | Tree stand sound dampener | Human Necessities | 9 | Active |
| US9204628B2 | Tree stand | Human Necessities | 9 | Active |
| US7212972B2 | Audio features description method and audio video features description collection construction method | Physics | 8 | Expired |
| USD661361S1 | Bull tire swing | General | 8 | Active |
| USD719680S1 | Tree stand platform | General | 7 | Active |
| US6261528A | Hydrogen purification using metal hydride getter material | Chemistry; Metallurgy | 7 | Expired |
| US9347451B2 | Livestock building design | Mechanical Engineering; Lighting; Heating | 6 | Active |
| US5985007A | Noble gas purifier with single purifier vessel and recuperative heat exchanger | Chemistry; Metallurgy | 6 | Expired |
| US6763059B2 | Spread spectrum signal demodulator | Electricity | 6 | Expired |
| USD623715S1 | Tractor tire swing | General | 6 | Expired |
| US6377388B1 | Optical signal processor | Physics | 5 | Expired |
| US6782201B2 | Four fiber ring network optical switching circuit using branched inputs | Electricity | 4 | Expired |
| US6748178B2 | Optical transmission line | Electricity | 4 | Expired |
| US6515793B2 | Optical waveform shaper | Electricity | 4 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.