Ken Sakamura
15Patents
5Active
15Granted
37Portfolio score
Filing activity: Aug 20, 1987 → Dec 17, 2007 · 5 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8306919B2 | IC card and authentication method in electronic ticket distribution system | Physics | 43 | Active |
| US7580897B2 | IC card and authentication method in electronic ticket distribution system | Physics | 11 | Expired |
| US7346718B2 | Autonomous integrated-circuit card | Physics | 8 | Expired |
| US7814557B2 | IC card and access control method | Physics | 6 | Active |
| US5210835A | Data processing system having apparatus for increasing the execution speed of bit field instructions | Physics | 6 | Expired |
| US7403924B2 | Communication terminal, portable terminal, circulating server, providing server, electronic book distributing method, and electronic book distributing program | Physics | 6 | Expired |
| US5398319A | Microprocessor having apparatus for dynamically controlling a kind of operation to be performed by instructions to be executed | Physics | 5 | Expired |
| US4941085A | Data processing system having apparatus for increasing the execution speed of bit field instructions | Physics | 5 | Expired |
| US7357329B2 | IC card, terminal device, and data communication method | Physics | 5 | Expired |
| US4926321A | Method of searching a queue in response to a search instruction | Emerging Cross-Sectional Technologies | 4 | Expired |
| US7416114B2 | Electronic value transfer device equipped with non-contact IC interface | Physics | 1 | Expired |
| US7340243B2 | Connection information management system for managing connection information used in communications between IC cards | Electricity | 0 | Expired |
| US8161499B2 | Data processing device and data processing method | Physics | 0 | Active |
| US7882030B2 | Connection information management system for managing connection information used in communications between IC cards | Physics | 0 | Active |
| US8468094B2 | Electronic value exchange system, mobile terminal, and electronic value exchange method | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.