Martin E. Hellman
7Patents
6Active
7Granted
44Portfolio score
Filing activity: May 31, 1984 → Jan 6, 2014 · 4 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4633036A | Method and apparatus for use in public-key data encryption system | Electricity | 76 | Expired |
| US7840178B2 | FM broadcast system competitive with satellite radio | Electricity | 44 | Active |
| US7865917B2 | Security enhanced tiered subscription broadcast system | Electricity | 20 | Active |
| US8627354B2 | Tiered subscription broadcast system | Electricity | 6 | Active |
| US8270901B2 | Dropout-resistant media broadcasting system | Electricity | 6 | Active |
| US8401462B2 | FM broadcast system competitive with satellite radio | Electricity | 3 | Active |
| US9124375B1 | Tiered subscription broadcast system | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.