Carl M. Campbell
19Patents
16h-index
9Co-inventors
71Inventor score
Filing activity: Nov 17, 1977 → Mar 11, 2002
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7177848B2 | Method and system for conducting secure payments over a computer network without a pseudo or proxy account number | Physics | 346 | Expired |
| US7379919B2 | Method and system for conducting secure payments over a computer network | Physics | 316 | Expired |
| US6990470B2 | Method and system for conducting secure payments over a computer network | Physics | 315 | Expired |
| US4160120A | Link encryption device | Electricity | 161 | Expired |
| US4908521A | Transaction approval system | Physics | 159 | Expired |
| US4605820A | Key management system for on-line communication | Physics | 154 | Expired |
| US4172213A | Byte stream selective encryption/decryption device | Electricity | 150 | Expired |
| US4408203A | Security system for electronic funds transfer system | Electricity | 149 | Expired |
| US4822985A | Transaction approval system | Physics | 138 | Expired |
| US4870259A | Transaction approval system | Physics | 135 | Expired |
| US4159468A | Communications line authentication device | Emerging Cross-Sectional Technologies | 129 | Expired |
| US4259720A | Security system for electronic funds transfer system | Electricity | 88 | Expired |
| US6915279B2 | System and method for conducting secure payment transactions | Physics | 82 | Expired |
| US5396624A | Account file for off-line transaction authorization | Emerging Cross-Sectional Technologies | 55 | Expired |
| US4369332A | Key variable generator for an encryption/decryption device | Electricity | 41 | Expired |
| US4304961A | Authenticator code generator | Electricity | 28 | Expired |
| US4314097A | Authenticator device for precluding compensating text modifications in transmitted messages | Electricity | 15 | Expired |
| US7636694B1 | Apparatus and method for generating an electronic-commerce personal identification number cryptographically related to an ATM personal identification number | Physics | 13 | Expired |
| US9672515B2 | Method and system for secure payments over a computer network | Physics | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.