21, Inc.
10Patents
8Active
10Granted
47Portfolio score
Filing activity: Mar 24, 1999 → Jul 31, 2019
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6391224B1 | Polyvinyl alcohol compounds for inhibition of ice growth | Chemistry; Metallurgy | 33 | Expired |
| US10839378B1 | Systems and methods for performing device authentication operations using cryptocurrency transactions | Physics | 14 | Active |
| US6568818B2 | Three dimensional real image system | Physics | 4 | Expired |
| US9942046B2 | Digital currency mining circuitry with adaptable difficulty compare capabilities | Electricity | 3 | Active |
| US11270298B2 | Digital currency mining circuitry | Electricity | 3 | Active |
| US9659123B2 | Systems and methods for flexibly optimizing processing circuit efficiency | Physics | 2 | Active |
| US10409827B2 | Digital currency mining circuitry having shared processing logic | Emerging Cross-Sectional Technologies | 1 | Active |
| US11301481B2 | Digital currency mining circuitry having shared processing logic | Emerging Cross-Sectional Technologies | 1 | Active |
| US10338558B2 | Sequential logic circuitry with reduced dynamic power consumption | Electricity | 1 | Active |
| US10558188B2 | Sequential logic circuitry with reduced dynamic power consumption | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.