Angstrom Technologies, Inc.
🏢 View company profile →21Patents
7Active
21Granted
41Portfolio score
Filing activity: Sep 27, 1993 → Nov 20, 2017 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6373965B1 | Apparatus and methods for authentication using partially fluorescent graphic images and OCR characters | Performing Operations; Transporting | 209 | Expired |
| US5867586A | Apparatus and methods for fluorescent imaging and optical character reading | Physics | 169 | Expired |
| US5719948A | Apparatus and methods for fluorescent imaging and optical character reading | Physics | 162 | Expired |
| US5414258A | Apparatus and method for calibration of fluorescence detectors | Physics | 80 | Expired |
| US5548106A | Methods and apparatus for authenticating data storage articles | Physics | 74 | Expired |
| US5418855A | Authentication system and method | Physics | 71 | Expired |
| US5574790A | Fluorescence authentication reader with coaxial optics | Physics | 61 | Expired |
| US5666417A | Fluorescence authentication reader with coaxial optics | Physics | 58 | Expired |
| US5605738A | Tamper resistant system using ultraviolet fluorescent chemicals | Emerging Cross-Sectional Technologies | 54 | Expired |
| US5714291A | System for authenticating printed or reproduced documents | Physics | 33 | Expired |
| US6603871B2 | First-order authentication system | Physics | 23 | Expired |
| US6470093B2 | First-order authentication system | Physics | 17 | Expired |
| US7821675B2 | Methods and ink compositions for invisibly printed security images having multiple authentication features | Chemistry; Metallurgy | 13 | Active |
| US5923024A | Apparatus and methods for controlling sensor signal hysteresis | Physics | 4 | Expired |
| US8535865B2 | Stable emissive toner composition system and method | Physics | 2 | Active |
| US9104126B2 | Stable emissive toner composition system and method | Physics | 2 | Active |
| USD453175S1 | Money checker | General | 1 | Expired |
| US9823594B2 | Stable emissive toner composition system and method | Physics | 0 | Active |
| US10082744B2 | Stable emissive toner composition system and method | Physics | 0 | Active |
| US8717625B2 | Emissive image substrate marking, articles marked with an emissive image, and authentication methods involving the same | Chemistry; Metallurgy | 0 | Active |
| US9470997B2 | Stable emissive toner composition system and method | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.