Issued Patents All Time
Showing 1–24 of 24 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4916294 | System for reliable digital recording on unreliable magnetic media | — | 1990-04-10 |
| 4837840 | System for verifying authenticity of various articles | — | 1989-06-06 |
| 4816824 | Merchandise verification and information system | Ronald A. Katz | 1989-03-28 |
| 4811408 | Image dissecting document verification system | — | 1989-03-07 |
| 4795890 | Device authentication system for on and off line use | — | 1989-01-03 |
| 4785290 | Non-counterfeitable document system | — | 1988-11-15 |
| 4739322 | Merchandise verification and information system | Ronald A. Katz | 1988-04-19 |
| 4734695 | Secure card and sensing system | — | 1988-03-29 |
| 4689477 | Verification system for document substance and content | — | 1987-08-25 |
| 4686527 | Verification system for document substance and content | — | 1987-08-11 |
| 4675669 | System of issuing secure documents of various denomination | — | 1987-06-23 |
| 4663622 | Non-counterfeitable document system | — | 1987-05-05 |
| 4656473 | Secure card and sensing system | David G. Gold | 1987-04-07 |
| 4651150 | Merchandise verification and information system | Ronald A. Katz | 1987-03-17 |
| 4635054 | Operator interactive device verification system | — | 1987-01-06 |
| 4568936 | Verification system for document substance and content | — | 1986-02-04 |
| 4558318 | Merchandise verification and information system | Ronald A. Katz | 1985-12-10 |
| 4546352 | Non-counterfeitable document system | — | 1985-10-08 |
| 4489318 | Non-counterfeitable document system | — | 1984-12-18 |
| 4476468 | Secure transaction card and verification system | — | 1984-10-09 |
| 4423415 | Non-counterfeitable document system | — | 1983-12-27 |
| RE30821 | Customer service unit | — | 1981-12-08 |
| RE30579 | Check authorization system | Ronald A. Katz | 1981-04-14 |
| RE30580 | Check authorization system | Ronald A. Katz | 1981-04-14 |